diff --git a/nixos/doc/manual/from_md/release-notes/rl-2111.section.xml b/nixos/doc/manual/from_md/release-notes/rl-2111.section.xml
index d60a100a2f2..5434e1d8919 100644
--- a/nixos/doc/manual/from_md/release-notes/rl-2111.section.xml
+++ b/nixos/doc/manual/from_md/release-notes/rl-2111.section.xml
@@ -1146,6 +1146,12 @@ Superuser created successfully.
           will no longer work and must be updated.
         </para>
       </listitem>
+      <listitem>
+        <para>
+          Nextcloud 20 (<literal>pkgs.nextcloud20</literal>) has been
+          dropped because it was EOLed by upstream in 2021-10.
+        </para>
+      </listitem>
     </itemizedlist>
   </section>
   <section xml:id="sec-release-21.11-notable-changes">
diff --git a/nixos/doc/manual/release-notes/rl-2111.section.md b/nixos/doc/manual/release-notes/rl-2111.section.md
index a8ca755d611..b97c6786b22 100644
--- a/nixos/doc/manual/release-notes/rl-2111.section.md
+++ b/nixos/doc/manual/release-notes/rl-2111.section.md
@@ -354,6 +354,8 @@ In addition to numerous new and upgraded packages, this release has the followin
 - The `services.mosquitto` module has been rewritten to support multiple listeners and per-listener configuration.
   Module configurations from previous releases will no longer work and must be updated.
 
+- Nextcloud 20 (`pkgs.nextcloud20`) has been dropped because it was EOLed by upstream in 2021-10.
+
 ## Other Notable Changes {#sec-release-21.11-notable-changes}
 
 
diff --git a/nixos/modules/services/web-apps/nextcloud.nix b/nixos/modules/services/web-apps/nextcloud.nix
index 62ae763b69b..034ee1ae127 100644
--- a/nixos/modules/services/web-apps/nextcloud.nix
+++ b/nixos/modules/services/web-apps/nextcloud.nix
@@ -153,7 +153,7 @@ in {
     package = mkOption {
       type = types.package;
       description = "Which package to use for the Nextcloud instance.";
-      relatedPackages = [ "nextcloud20" "nextcloud21" "nextcloud22" ];
+      relatedPackages = [ "nextcloud21" "nextcloud22" ];
     };
     phpPackage = mkOption {
       type = types.package;
@@ -547,7 +547,6 @@ in {
           Using config.services.nextcloud.poolConfig is deprecated and will become unsupported in a future release.
           Please migrate your configuration to config.services.nextcloud.poolSettings.
         '')
-        ++ (optional (versionOlder cfg.package.version "20") (upgradeWarning 19 "21.05"))
         ++ (optional (versionOlder cfg.package.version "21") (upgradeWarning 20 "21.05"))
         ++ (optional (versionOlder cfg.package.version "22") (upgradeWarning 21 "21.11"))
         ++ (optional isUnsupportedMariadb ''
@@ -574,7 +573,11 @@ in {
           # This versionOlder statement remains set to 21.03 for backwards compatibility.
           # See https://github.com/NixOS/nixpkgs/pull/108899 and
           # https://github.com/NixOS/rfcs/blob/master/rfcs/0080-nixos-release-schedule.md.
-          else if versionOlder stateVersion "21.03" then nextcloud19
+          # FIXME(@Ma27) remove this else-if as soon as 21.05 is EOL! This is only here
+          # to ensure that users who are on Nextcloud 19 with a stateVersion <21.05 with
+          # no explicit services.nextcloud.package don't upgrade to v21 by accident (
+          # nextcloud20 throws an eval-error because it's dropped).
+          else if versionOlder stateVersion "21.03" then nextcloud20
           else if versionOlder stateVersion "21.11" then nextcloud21
           else nextcloud22
         );
diff --git a/nixos/tests/nextcloud/default.nix b/nixos/tests/nextcloud/default.nix
index 65043e509b3..bd7a7aacdc9 100644
--- a/nixos/tests/nextcloud/default.nix
+++ b/nixos/tests/nextcloud/default.nix
@@ -18,4 +18,4 @@ foldl
     };
   })
   {}
-  [ 20 21 22 ]
+  [ 21 22 ]
diff --git a/pkgs/servers/nextcloud/default.nix b/pkgs/servers/nextcloud/default.nix
index e71741731f6..8b59ae54265 100644
--- a/pkgs/servers/nextcloud/default.nix
+++ b/pkgs/servers/nextcloud/default.nix
@@ -33,20 +33,17 @@ let
     };
   };
 in {
-  nextcloud19 = throw ''
-    Nextcloud v19 has been removed from `nixpkgs` as the support for it was dropped
-    by upstream in 2021-06. Please upgrade to at least Nextcloud v20 by
-    declaring
+  nextcloud20 = throw ''
+    Nextcloud v20 has been removed from `nixpkgs` as the support for it was dropped
+    by upstream in 2021-10. Please upgrade to at least Nextcloud v21 by declaring
 
-        services.nextcloud.package = pkgs.nextcloud20;
+        services.nextcloud.package = pkgs.nextcloud21;
 
     in your NixOS config.
-  '';
 
-  nextcloud20 = generic {
-    version = "20.0.13";
-    sha256 = "15mi51aayi3m8brxc0w51mbxp4h3hjv14gr5mm7ch2930x655gg9";
-  };
+    WARNING: if you were on Nextcloud 19 on NixOS 21.05 you have to upgrade to Nextcloud 20
+    first on 21.05 because Nextcloud doesn't support upgrades accross multiple major versions!
+  '';
 
   nextcloud21 = generic {
     version = "21.0.5";
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 7f28a4072f4..3663dbf4286 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -7768,7 +7768,7 @@ with pkgs;
   grocy = callPackage ../servers/grocy { };
 
   inherit (callPackage ../servers/nextcloud {})
-    nextcloud19 nextcloud20 nextcloud21 nextcloud22;
+    nextcloud20 nextcloud21 nextcloud22;
 
   nextcloud-client = libsForQt5.callPackage ../applications/networking/nextcloud-client { };