diff --git a/modules/lib/maintainers.nix b/modules/lib/maintainers.nix
index 4684ad38f..f2657a82c 100644
--- a/modules/lib/maintainers.nix
+++ b/modules/lib/maintainers.nix
@@ -393,6 +393,18 @@
       }
     ];
   };
+  karaolidis = {
+    name = "Nikolaos Karaolidis";
+    email = "nick@karaolidis.com";
+    github = "karaolidis";
+    githubId = 46189100;
+    keys = [
+      {
+        longKeyId = "rsa4096/0xF8549CDF32F178F7";
+        fingerprint = "E3E3 0A72 EBB3 4375 414B  23FD F854 9CDF 32F1 78F7";
+      }
+    ];
+  };
   katexochen = {
     name = "Paul Meyer";
     email = "49727155+katexochen@users.noreply.github.com";
diff --git a/modules/modules.nix b/modules/modules.nix
index 3f0fa75af..bd88f8ada 100644
--- a/modules/modules.nix
+++ b/modules/modules.nix
@@ -216,6 +216,7 @@ let
       ./programs/numbat.nix
       ./programs/nushell.nix
       ./programs/obs-studio.nix
+      ./programs/obsidian.nix
       ./programs/octant.nix
       ./programs/offlineimap.nix
       ./programs/oh-my-posh.nix
diff --git a/modules/programs/obsidian.nix b/modules/programs/obsidian.nix
new file mode 100644
index 000000000..e77e31c29
--- /dev/null
+++ b/modules/programs/obsidian.nix
@@ -0,0 +1,579 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}:
+let
+  inherit (lib)
+    mkOption
+    mkEnableOption
+    mkPackageOption
+    mkDefault
+    literalExpression
+    types
+    ;
+
+  cfg = config.programs.obsidian;
+
+  corePlugins = [
+    "audio-recorder"
+    "backlink"
+    "bookmarks"
+    "canvas"
+    "command-palette"
+    "daily-notes"
+    "editor-status"
+    "file-explorer"
+    "file-recovery"
+    "global-search"
+    "graph"
+    "markdown-importer"
+    "note-composer"
+    "outgoing-link"
+    "outline"
+    "page-preview"
+    "properties"
+    "publish"
+    "random-note"
+    "slash-command"
+    "slides"
+    "switcher"
+    "sync"
+    "tag-pane"
+    "templates"
+    "word-count"
+    "workspaces"
+    "zk-prefixer"
+  ];
+in
+{
+  options.programs.obsidian = {
+    enable = mkEnableOption "obsidian";
+    package = mkPackageOption pkgs "obsidian" { };
+
+    defaultSettings = {
+      app = mkOption {
+        description = ''
+          Settings to write to `app.json`.
+
+          Vault-specific settings take priority and will override these, if set.
+        '';
+        type = types.raw;
+        default = { };
+      };
+
+      appearance = mkOption {
+        description = ''
+          Settings to write to `appearance.json`.
+
+          Vault-specific settings take priority and will override these, if set.
+        '';
+        type = types.raw;
+        default = { };
+      };
+
+      corePlugins = mkOption {
+        description = ''
+          Core plugins to activate.
+
+          Vault-specific settings take priority and will override these, if set.
+        '';
+        type = types.raw;
+        default = [
+          "backlink"
+          "bookmarks"
+          "canvas"
+          "command-palette"
+          "daily-notes"
+          "editor-status"
+          "file-explorer"
+          "file-recovery"
+          "global-search"
+          "graph"
+          "note-composer"
+          "outgoing-link"
+          "outline"
+          "page-preview"
+          "switcher"
+          "tag-pane"
+          "templates"
+          "word-count"
+        ];
+      };
+
+      communityPlugins = mkOption {
+        description = "
+          Community plugins to install and activate.
+
+          Vault-specific settings take priority and will override these, if set.
+        ";
+        type = types.raw;
+        default = [ ];
+      };
+
+      cssSnippets = mkOption {
+        description = "
+          CSS snippets to install.
+
+          Vault-specific settings take priority and will override these, if set.
+        ";
+        type = types.raw;
+        default = [ ];
+      };
+
+      themes = mkOption {
+        description = "
+          Themes to install.
+
+          Vault-specific settings take priority and will override these, if set.
+        ";
+        type = types.raw;
+        default = [ ];
+      };
+
+      hotkeys = mkOption {
+        description = "
+          Hotkeys to configure.
+
+          Vault-specific settings take priority and will override these, if set.
+        ";
+        type = types.raw;
+        default = { };
+      };
+
+      extraFiles = mkOption {
+        description = "
+          Extra files to link to the vault directory.
+
+          Vault-specific settings take priority and will override these, if set.
+        ";
+        type = types.raw;
+        default = { };
+      };
+    };
+
+    vaults = mkOption {
+      description = "List of vaults to create.";
+      type = types.attrsOf (
+        types.submodule (
+          { name, config, ... }:
+          {
+            options = {
+              enable = mkOption {
+                type = types.bool;
+                default = true;
+                description = "Whether this vault should be generated.";
+              };
+
+              target = mkOption {
+                type = types.str;
+                defaultText = literalExpression "name";
+                description = "Path to target vault relative to the user's {env}`HOME`.";
+              };
+
+              settings = {
+                app = mkOption {
+                  description = "Settings to write to app.json.";
+                  type = with types; attrsOf anything;
+                  default = cfg.defaultSettings.app;
+                };
+
+                appearance = mkOption {
+                  description = "Settings to write to appearance.json.";
+                  type = with types; attrsOf anything;
+                  default = cfg.defaultSettings.appearance;
+                };
+
+                corePlugins =
+                  let
+                    corePluginsOptions =
+                      { config, ... }:
+                      {
+                        options = {
+                          enable = mkOption {
+                            type = types.bool;
+                            default = true;
+                            description = "Whether to enable the plugin.";
+                          };
+
+                          name = mkOption {
+                            type = types.enum corePlugins;
+                            description = "The plugin.";
+                          };
+
+                          settings = mkOption {
+                            type = with types; attrsOf anything;
+                            description = "Plugin settings to include.";
+                            default = { };
+                          };
+                        };
+                      };
+                  in
+                  mkOption {
+                    description = "Core plugins to activate.";
+                    type =
+                      with types;
+                      listOf (coercedTo (enum corePlugins) (p: { name = p; }) (submodule corePluginsOptions));
+                    default = cfg.defaultSettings.corePlugins;
+                  };
+
+                communityPlugins =
+                  let
+                    communityPluginsOptions =
+                      { config, ... }:
+                      {
+                        options = {
+                          enable = mkOption {
+                            type = types.bool;
+                            default = true;
+                            description = "Whether to enable the plugin.";
+                          };
+
+                          pkg = mkOption {
+                            type = types.package;
+                            description = "The plugin package.";
+                          };
+
+                          settings = mkOption {
+                            type = with types; attrsOf anything;
+                            description = "Settings to include in the plugin's `data.json`.";
+                            default = { };
+                          };
+                        };
+                      };
+                  in
+                  mkOption {
+                    description = "Community plugins to install and activate.";
+                    type = with types; listOf (coercedTo package (p: { pkg = p; }) (submodule communityPluginsOptions));
+                    default = cfg.defaultSettings.communityPlugins;
+                  };
+
+                cssSnippets =
+                  let
+                    checkCssPath = path: lib.filesystem.pathIsRegularFile path && lib.strings.hasSuffix ".css" path;
+                    toCssName = path: lib.strings.removeSuffix ".css" (builtins.baseNameOf path);
+                    cssSnippetsOptions =
+                      { config, ... }:
+                      {
+                        options = {
+                          enable = mkOption {
+                            type = types.bool;
+                            default = true;
+                            description = "Whether to enable the snippet.";
+                          };
+
+                          name = mkOption {
+                            type = types.str;
+                            defaultText = literalExpression ''lib.strings.removeSuffix ".css" (builtins.baseNameOf source)'';
+                            description = "Name of the snippet.";
+                          };
+
+                          source = mkOption {
+                            type = with types; nullOr (addCheck path checkCssPath);
+                            description = "Path of the source file.";
+                            default = null;
+                          };
+
+                          text = mkOption {
+                            type = with types; nullOr str;
+                            description = "Text of the file.";
+                            default = null;
+                          };
+                        };
+
+                        config.name = mkDefault (toCssName config.source);
+                      };
+                  in
+                  mkOption {
+                    description = "CSS snippets to install.";
+                    type =
+                      with types;
+                      listOf (coercedTo (addCheck path checkCssPath) (p: { source = p; }) (submodule cssSnippetsOptions));
+                    default = cfg.defaultSettings.cssSnippets;
+                  };
+
+                themes =
+                  let
+                    themesOptions =
+                      { config, ... }:
+                      {
+                        options = {
+                          enable = mkOption {
+                            type = types.bool;
+                            default = true;
+                            description = "Whether to set the theme as active.";
+                          };
+
+                          pkg = mkOption {
+                            type = types.package;
+                            description = "The theme package.";
+                          };
+                        };
+                      };
+                  in
+                  mkOption {
+                    description = "Themes to install.";
+                    type = with types; listOf (coercedTo package (p: { pkg = p; }) (submodule themesOptions));
+                    default = cfg.defaultSettings.themes;
+                  };
+
+                hotkeys =
+                  let
+                    hotkeysOptions =
+                      { config, ... }:
+                      {
+                        options = {
+                          modifiers = mkOption {
+                            type = with types; listOf str;
+                            description = "The hotkey modifiers.";
+                            default = [ ];
+                          };
+
+                          key = mkOption {
+                            type = types.str;
+                            description = "The hotkey.";
+                          };
+                        };
+                      };
+                  in
+                  mkOption {
+                    description = "Hotkeys to configure.";
+                    type = with types; attrsOf (listOf (submodule hotkeysOptions));
+                    default = cfg.defaultSettings.hotkeys;
+                  };
+
+                extraFiles =
+                  let
+                    extraFilesOptions =
+                      { name, config, ... }:
+                      {
+                        options = {
+                          source = mkOption {
+                            type = with types; nullOr path;
+                            description = "Path of the source file or directory.";
+                            default = null;
+                          };
+
+                          text = mkOption {
+                            type = with types; nullOr str;
+                            description = "Text of the file.";
+                            default = null;
+                          };
+
+                          target = mkOption {
+                            type = types.str;
+                            defaultText = literalExpression "name";
+                            description = "Path to target relative to the vault's directory.";
+                          };
+                        };
+
+                        config.target = mkDefault name;
+                      };
+                  in
+                  mkOption {
+                    description = "Extra files to link to the vault directory.";
+                    type = with types; attrsOf (submodule extraFilesOptions);
+                    default = cfg.defaultSettings.extraFiles;
+                  };
+              };
+            };
+
+            config.target = mkDefault name;
+          }
+        )
+      );
+      default = { };
+    };
+  };
+
+  config =
+    let
+      vaults = builtins.filter (vault: vault.enable == true) (builtins.attrValues cfg.vaults);
+      getManifest =
+        item:
+        let
+          manifest = builtins.fromJSON (builtins.readFile "${item.pkg}/manifest.json");
+        in
+        manifest.id or manifest.name;
+    in
+    lib.mkIf cfg.enable {
+      home = {
+        packages = [ cfg.package ];
+
+        file =
+          let
+            mkApp = vault: {
+              name = "${vault.target}/.obsidian/app.json";
+              value.source = (pkgs.formats.json { }).generate "app.json" vault.settings.app;
+            };
+
+            mkAppearance = vault: {
+              name = "${vault.target}/.obsidian/appearance.json";
+              value =
+                let
+                  enabledCssSnippets = builtins.filter (snippet: snippet.enable) vault.settings.cssSnippets;
+                  activeTheme = lib.lists.findSingle (
+                    theme: theme.enable
+                  ) null (throw "Only one theme can be enabled at a time.") vault.settings.themes;
+                in
+                {
+                  source = (pkgs.formats.json { }).generate "appearance.json" (
+                    vault.settings.appearance
+                    // {
+                      enabledCssSnippets = builtins.map (snippet: snippet.name) enabledCssSnippets;
+                    }
+                    // lib.attrsets.optionalAttrs (activeTheme != null) {
+                      cssTheme = getManifest activeTheme;
+                    }
+                  );
+                };
+            };
+
+            mkCorePlugins =
+              vault:
+              [
+                {
+                  name = "${vault.target}/.obsidian/core-plugins.json";
+                  value.source = (pkgs.formats.json { }).generate "core-plugins.json" (
+                    builtins.map (plugin: plugin.name) vault.settings.corePlugins
+                  );
+                }
+                {
+                  name = "${vault.target}/.obsidian/core-plugins-migration.json";
+                  value.source = (pkgs.formats.json { }).generate "core-plugins-migration.json" (
+                    builtins.listToAttrs (
+                      builtins.map (name: {
+                        inherit name;
+                        value = builtins.any (plugin: name == plugin.name && plugin.enable) vault.settings.corePlugins;
+                      }) corePlugins
+                    )
+                  );
+                }
+              ]
+              ++ builtins.map (plugin: {
+                name = "${vault.target}/.obsidian/${plugin.name}.json";
+                value.source = (pkgs.formats.json { }).generate "${plugin.name}.json" plugin.settings;
+              }) (builtins.filter (plugin: plugin.settings != { }) vault.settings.corePlugins);
+
+            mkCommunityPlugins =
+              vault:
+              [
+                {
+                  name = "${vault.target}/.obsidian/community-plugins.json";
+                  value.source = (pkgs.formats.json { }).generate "community-plugins.json" (
+                    builtins.map getManifest (builtins.filter (plugin: plugin.enable) vault.settings.communityPlugins)
+                  );
+                }
+              ]
+              ++ builtins.map (plugin: {
+                name = "${vault.target}/.obsidian/plugins/${getManifest plugin}";
+                value = {
+                  source = plugin.pkg;
+                  recursive = true;
+                };
+              }) vault.settings.communityPlugins
+              ++ builtins.map (plugin: {
+                name = "${vault.target}/.obsidian/plugins/${getManifest plugin}/data.json";
+                value.source = (pkgs.formats.json { }).generate "data.json" plugin.settings;
+              }) (builtins.filter (plugin: plugin.settings != { }) vault.settings.communityPlugins);
+
+            mkCssSnippets =
+              vault:
+              builtins.map (snippet: {
+                name = "${vault.target}/.obsidian/snippets/${snippet.name}.css";
+                value =
+                  if snippet.source != null then
+                    {
+                      inherit (snippet) source;
+                    }
+                  else
+                    {
+                      inherit (snippet) text;
+                    };
+              }) vault.settings.cssSnippets;
+
+            mkThemes =
+              vault:
+              builtins.map (theme: {
+                name = "${vault.target}/.obsidian/themes/${getManifest theme}";
+                value.source = theme.pkg;
+              }) vault.settings.themes;
+
+            mkHotkeys = vault: {
+              name = "${vault.target}/.obsidian/hotkeys.json";
+              value.source = (pkgs.formats.json { }).generate "hotkeys.json" vault.settings.hotkeys;
+            };
+
+            mkExtraFiles =
+              vault:
+              builtins.map (file: {
+                name = "${vault.target}/.obsidian/${file.target}";
+                value =
+                  if file.source != null then
+                    {
+                      inherit (file) source;
+                    }
+                  else
+                    {
+                      inherit (file) text;
+                    };
+              }) (builtins.attrValues vault.settings.extraFiles);
+          in
+          builtins.listToAttrs (
+            lib.lists.flatten (
+              builtins.map (vault: [
+                (mkApp vault)
+                (mkAppearance vault)
+                (mkCorePlugins vault)
+                (mkCommunityPlugins vault)
+                (mkCssSnippets vault)
+                (mkThemes vault)
+                (mkHotkeys vault)
+                (mkExtraFiles vault)
+              ]) vaults
+            )
+          );
+      };
+
+      xdg.configFile."obsidian/obsidian.json".source = (pkgs.formats.json { }).generate "obsidian.json" {
+        vaults = builtins.listToAttrs (
+          builtins.map (vault: {
+            name = builtins.hashString "md5" vault.target;
+            value =
+              {
+                path = "${config.home.homeDirectory}/${vault.target}";
+              }
+              // (lib.attrsets.optionalAttrs ((builtins.length vaults) == 1) {
+                open = true;
+              });
+          }) vaults
+        );
+        updateDisabled = true;
+      };
+
+      assertions = [
+        {
+          assertion = builtins.all (
+            vault:
+            builtins.all (
+              snippet:
+              (snippet.source == null || snippet.text == null) && (snippet.source != null || snippet.text != null)
+            ) vault.settings.cssSnippets
+          ) (builtins.attrValues cfg.vaults);
+          message = "Each CSS snippet must have one of 'source' or 'text' set";
+        }
+        {
+          assertion = builtins.all (
+            vault:
+            builtins.all (
+              file: (file.source == null || file.text == null) && (file.source != null || file.text != null)
+            ) (builtins.attrValues vault.settings.extraFiles)
+          ) (builtins.attrValues cfg.vaults);
+          message = "Each extra file must have one of 'source' or 'text' set";
+        }
+      ];
+    };
+
+  meta.maintainers = [ lib.hm.maintainers.karaolidis ];
+}