diff --git a/nixos/doc/manual/release-notes/rl-1909.xml b/nixos/doc/manual/release-notes/rl-1909.xml
index 3c0699b4b539..0b3d2d0c4fd8 100644
--- a/nixos/doc/manual/release-notes/rl-1909.xml
+++ b/nixos/doc/manual/release-notes/rl-1909.xml
@@ -297,6 +297,11 @@
      <literal>phd</literal> service have been removed from nixpkgs due to lack of maintainer.
     </para>
    </listitem>
+   <listitem>
+    <para>
+     The <literal>mercurial</literal> <literal>httpd.extraSubservice</literal> has been removed from nixpkgs due to lack of maintainer.
+    </para>
+   </listitem>
   </itemizedlist>
  </section>
 </section>
diff --git a/nixos/modules/services/web-servers/apache-httpd/mercurial.nix b/nixos/modules/services/web-servers/apache-httpd/mercurial.nix
deleted file mode 100644
index 4b8ee2b17ea7..000000000000
--- a/nixos/modules/services/web-servers/apache-httpd/mercurial.nix
+++ /dev/null
@@ -1,75 +0,0 @@
-{ config, pkgs, lib, ... }:
-
-let
-  inherit (pkgs) mercurial;
-  inherit (lib) mkOption;
-
-  urlPrefix = config.urlPrefix;
-
-  cgi = pkgs.stdenv.mkDerivation {
-    name = "mercurial-cgi";
-    buildCommand = ''
-      mkdir -p $out
-      cp -v ${mercurial}/share/cgi-bin/hgweb.cgi $out
-      sed -i "s|/path/to/repo/or/config|$out/hgweb.config|" $out/hgweb.cgi
-      echo "
-      [collections]
-      ${config.dataDir} = ${config.dataDir}
-      [web]
-      style = gitweb
-      allow_push = *
-      " > $out/hgweb.config
-    '';
-  };
-
-in {
-
-  extraConfig = ''
-    RewriteEngine on
-    RewriteRule /(.*) ${cgi}/hgweb.cgi/$1
-
-    <Location "${urlPrefix}">
-        AuthType Basic
-        AuthName "Mercurial repositories"
-        AuthUserFile ${config.dataDir}/hgusers
-        <LimitExcept GET>
-            Require valid-user
-        </LimitExcept>
-    </Location>
-    <Directory "${cgi}">
-        Order allow,deny
-        Allow from all
-        AllowOverride All
-        Options ExecCGI
-        AddHandler cgi-script .cgi
-        PassEnv PYTHONPATH
-    </Directory>
-  '';
-
-  robotsEntries = ''
-    User-agent: *
-    Disallow: ${urlPrefix}
-  '';
-
-  extraServerPath = [ pkgs.python ];
-
-  globalEnvVars = [ { name = "PYTHONPATH"; value = "${mercurial}/lib/${pkgs.python.libPrefix}/site-packages"; } ];
-
-  options = {
-    urlPrefix = mkOption {
-      default = "/hg";
-      description = "
-        The URL prefix under which the Mercurial service appears.
-        Use the empty string to have it appear in the server root.
-      ";
-    };
-
-    dataDir = mkOption {
-      example = "/data/mercurial";
-      description = "
-        Path to the directory that holds the repositories.
-      ";
-    };
-  };
-
-}