diff --git a/nixos/doc/manual/release-notes/rl-2311.section.md b/nixos/doc/manual/release-notes/rl-2311.section.md
index 74d29ab1cf9c..dc8f989c686f 100644
--- a/nixos/doc/manual/release-notes/rl-2311.section.md
+++ b/nixos/doc/manual/release-notes/rl-2311.section.md
@@ -488,6 +488,8 @@ The module update takes care of the new config syntax and the data itself (user
 
   If you use this feature, updates to CoreDNS may require updating `vendorHash` by following these steps again.
 
+- `postgresql_11` has been removed since it'll stop receiving fixes on November 9 2023.
+
 - `ffmpeg` default upgraded from `ffmpeg_5` to `ffmpeg_6`.
 
 - `fusuma` now enables the following plugins: [appmatcher](https://github.com/iberianpig/fusuma-plugin-appmatcher), [keypress](https://github.com/iberianpig/fusuma-plugin-keypress), [sendkey](https://github.com/iberianpig/fusuma-plugin-sendkey), [tap](https://github.com/iberianpig/fusuma-plugin-tap) and [wmctrl](https://github.com/iberianpig/fusuma-plugin-wmctrl).
diff --git a/nixos/modules/services/backup/postgresql-wal-receiver.nix b/nixos/modules/services/backup/postgresql-wal-receiver.nix
index 01fd57f5c506..773dc0ba447d 100644
--- a/nixos/modules/services/backup/postgresql-wal-receiver.nix
+++ b/nixos/modules/services/backup/postgresql-wal-receiver.nix
@@ -7,7 +7,7 @@ let
     options = {
       postgresqlPackage = mkOption {
         type = types.package;
-        example = literalExpression "pkgs.postgresql_11";
+        example = literalExpression "pkgs.postgresql_15";
         description = lib.mdDoc ''
           PostgreSQL package to use.
         '';
@@ -124,7 +124,7 @@ in {
         example = literalExpression ''
           {
             main = {
-              postgresqlPackage = pkgs.postgresql_11;
+              postgresqlPackage = pkgs.postgresql_15;
               directory = /mnt/pg_wal/main/;
               slot = "main_wal_receiver";
               connection = "postgresql://user@somehost";
diff --git a/nixos/modules/services/databases/postgresql.md b/nixos/modules/services/databases/postgresql.md
index 4d66ee38be42..e4b679a3eee0 100644
--- a/nixos/modules/services/databases/postgresql.md
+++ b/nixos/modules/services/databases/postgresql.md
@@ -17,9 +17,9 @@ PostgreSQL is an advanced, free relational database.
 To enable PostgreSQL, add the following to your {file}`configuration.nix`:
 ```
 services.postgresql.enable = true;
-services.postgresql.package = pkgs.postgresql_11;
+services.postgresql.package = pkgs.postgresql_15;
 ```
-Note that you are required to specify the desired version of PostgreSQL (e.g. `pkgs.postgresql_11`). Since upgrading your PostgreSQL version requires a database dump and reload (see below), NixOS cannot provide a default value for [](#opt-services.postgresql.package) such as the most recent release of PostgreSQL.
+Note that you are required to specify the desired version of PostgreSQL (e.g. `pkgs.postgresql_15`). Since upgrading your PostgreSQL version requires a database dump and reload (see below), NixOS cannot provide a default value for [](#opt-services.postgresql.package) such as the most recent release of PostgreSQL.
 
 <!--
 After running {command}`nixos-rebuild`, you can verify
@@ -119,27 +119,27 @@ A complete list of options for the PostgreSQL module may be found [here](#opt-se
 
 ## Plugins {#module-services-postgres-plugins}
 
-Plugins collection for each PostgreSQL version can be accessed with `.pkgs`. For example, for `pkgs.postgresql_11` package, its plugin collection is accessed by `pkgs.postgresql_11.pkgs`:
+Plugins collection for each PostgreSQL version can be accessed with `.pkgs`. For example, for `pkgs.postgresql_15` package, its plugin collection is accessed by `pkgs.postgresql_15.pkgs`:
 ```ShellSession
 $ nix repl '<nixpkgs>'
 
 Loading '<nixpkgs>'...
 Added 10574 variables.
 
-nix-repl> postgresql_11.pkgs.<TAB><TAB>
-postgresql_11.pkgs.cstore_fdw        postgresql_11.pkgs.pg_repack
-postgresql_11.pkgs.pg_auto_failover  postgresql_11.pkgs.pg_safeupdate
-postgresql_11.pkgs.pg_bigm           postgresql_11.pkgs.pg_similarity
-postgresql_11.pkgs.pg_cron           postgresql_11.pkgs.pg_topn
-postgresql_11.pkgs.pg_hll            postgresql_11.pkgs.pgjwt
-postgresql_11.pkgs.pg_partman        postgresql_11.pkgs.pgroonga
+nix-repl> postgresql_15.pkgs.<TAB><TAB>
+postgresql_15.pkgs.cstore_fdw        postgresql_15.pkgs.pg_repack
+postgresql_15.pkgs.pg_auto_failover  postgresql_15.pkgs.pg_safeupdate
+postgresql_15.pkgs.pg_bigm           postgresql_15.pkgs.pg_similarity
+postgresql_15.pkgs.pg_cron           postgresql_15.pkgs.pg_topn
+postgresql_15.pkgs.pg_hll            postgresql_15.pkgs.pgjwt
+postgresql_15.pkgs.pg_partman        postgresql_15.pkgs.pgroonga
 ...
 ```
 
 To add plugins via NixOS configuration, set `services.postgresql.extraPlugins`:
 ```
-services.postgresql.package = pkgs.postgresql_11;
-services.postgresql.extraPlugins = with pkgs.postgresql_11.pkgs; [
+services.postgresql.package = pkgs.postgresql_12;
+services.postgresql.extraPlugins = with pkgs.postgresql_12.pkgs; [
   pg_repack
   postgis
 ];
@@ -148,7 +148,7 @@ services.postgresql.extraPlugins = with pkgs.postgresql_11.pkgs; [
 You can build custom PostgreSQL-with-plugins (to be used outside of NixOS) using function `.withPackages`. For example, creating a custom PostgreSQL package in an overlay can look like:
 ```
 self: super: {
-  postgresql_custom = self.postgresql_11.withPackages (ps: [
+  postgresql_custom = self.postgresql_12.withPackages (ps: [
     ps.pg_repack
     ps.postgis
   ]);
@@ -158,9 +158,9 @@ self: super: {
 Here's a recipe on how to override a particular plugin through an overlay:
 ```
 self: super: {
-  postgresql_11 = super.postgresql_11.override { this = self.postgresql_11; } // {
-    pkgs = super.postgresql_11.pkgs // {
-      pg_repack = super.postgresql_11.pkgs.pg_repack.overrideAttrs (_: {
+  postgresql_15 = super.postgresql_15.override { this = self.postgresql_15; } // {
+    pkgs = super.postgresql_15.pkgs // {
+      pg_repack = super.postgresql_15.pkgs.pg_repack.overrideAttrs (_: {
         name = "pg_repack-v20181024";
         src = self.fetchzip {
           url = "https://github.com/reorg/pg_repack/archive/923fa2f3c709a506e111cc963034bf2fd127aa00.tar.gz";
diff --git a/nixos/modules/services/databases/postgresql.nix b/nixos/modules/services/databases/postgresql.nix
index 2d4ef0563182..21e6a60e32a3 100644
--- a/nixos/modules/services/databases/postgresql.nix
+++ b/nixos/modules/services/databases/postgresql.nix
@@ -55,7 +55,7 @@ in
 
       package = mkOption {
         type = types.package;
-        example = literalExpression "pkgs.postgresql_11";
+        example = literalExpression "pkgs.postgresql_15";
         description = lib.mdDoc ''
           PostgreSQL package to use.
         '';
@@ -78,7 +78,7 @@ in
       dataDir = mkOption {
         type = types.path;
         defaultText = literalExpression ''"/var/lib/postgresql/''${config.services.postgresql.package.psqlSchema}"'';
-        example = "/var/lib/postgresql/11";
+        example = "/var/lib/postgresql/15";
         description = lib.mdDoc ''
           The data directory for PostgreSQL. If left as the default value
           this directory will automatically be created before the PostgreSQL server starts, otherwise
@@ -387,7 +387,7 @@ in
       extraPlugins = mkOption {
         type = types.listOf types.path;
         default = [];
-        example = literalExpression "with pkgs.postgresql_11.pkgs; [ postgis pg_repack ]";
+        example = literalExpression "with pkgs.postgresql_15.pkgs; [ postgis pg_repack ]";
         description = lib.mdDoc ''
           List of PostgreSQL plugins. PostgreSQL version for each plugin should
           match version for `services.postgresql.package` value.
@@ -399,7 +399,7 @@ in
         default = {};
         description = lib.mdDoc ''
           PostgreSQL configuration. Refer to
-          <https://www.postgresql.org/docs/11/config-setting.html#CONFIG-SETTING-CONFIGURATION-FILE>
+          <https://www.postgresql.org/docs/15/config-setting.html#CONFIG-SETTING-CONFIGURATION-FILE>
           for an overview of `postgresql.conf`.
 
           ::: {.note}
@@ -461,7 +461,7 @@ in
         base = if versionAtLeast config.system.stateVersion "23.11" then pkgs.postgresql_15
             else if versionAtLeast config.system.stateVersion "22.05" then pkgs.postgresql_14
             else if versionAtLeast config.system.stateVersion "21.11" then pkgs.postgresql_13
-            else if versionAtLeast config.system.stateVersion "20.03" then pkgs.postgresql_11
+            else if versionAtLeast config.system.stateVersion "20.03" then mkThrow "11"
             else if versionAtLeast config.system.stateVersion "17.09" then mkThrow "9_6"
             else mkThrow "9_5";
     in
diff --git a/nixos/tests/postgresql.nix b/nixos/tests/postgresql.nix
index b44849e0a14e..c0dd24cf6ad2 100644
--- a/nixos/tests/postgresql.nix
+++ b/nixos/tests/postgresql.nix
@@ -219,8 +219,6 @@ let
 in
   concatMapAttrs (name: package: {
     ${name} = make-postgresql-test name package false;
+    ${name + "-backup-all"} = make-postgresql-test "${name + "-backup-all"}" package true;
     ${name + "-clauses"} = mk-ensure-clauses-test name package;
   }) postgresql-versions
-  // {
-    postgresql_11-backup-all = make-postgresql-test "postgresql_11-backup-all" postgresql-versions.postgresql_11 true;
-  }
diff --git a/pkgs/applications/misc/glom/default.nix b/pkgs/applications/misc/glom/default.nix
index 363e6fadee41..5c8eb94712a6 100644
--- a/pkgs/applications/misc/glom/default.nix
+++ b/pkgs/applications/misc/glom/default.nix
@@ -28,7 +28,7 @@
 , isocodes
 , gtksourceview
 , gtksourceviewmm
-, postgresql_11
+, postgresql_15
 , gobject-introspection
 , yelp-tools
 , wrapGAppsHook
@@ -93,7 +93,7 @@ in stdenv.mkDerivation rec {
     python3.pkgs.pygobject3
     gtksourceview
     gtksourceviewmm
-    postgresql_11 # for pg_config
+    postgresql_15 # for postgresql utils
   ];
 
   enableParallelBuilding = true;
@@ -102,6 +102,7 @@ in stdenv.mkDerivation rec {
 
   configureFlags = [
     "--with-boost-python=boost_python${lib.versions.major python3.version}${lib.versions.minor python3.version}"
+    "--with-postgres-utils=${lib.getBin postgresql_15}/bin"
   ];
 
   makeFlags = [
diff --git a/pkgs/servers/sql/postgresql/default.nix b/pkgs/servers/sql/postgresql/default.nix
index 6bf881d52815..427a394873fa 100644
--- a/pkgs/servers/sql/postgresql/default.nix
+++ b/pkgs/servers/sql/postgresql/default.nix
@@ -344,17 +344,6 @@ let
   };
 
   mkPackages = self: {
-    # TODO: remove ahead of 23.11 branchoff
-    # "PostgreSQL 11 will stop receiving fixes on November 9, 2023"
-    postgresql_11 = self.callPackage generic {
-      version = "11.21";
-      psqlSchema = "11.1"; # should be 11, but changing it is invasive
-      hash = "sha256-B7CDdHHV3XeyUWazRxjzuhCBa2rWHmkeb8VHzz/P+FA=";
-      this = self.postgresql_11;
-      thisAttr = "postgresql_11";
-      inherit self;
-    };
-
     postgresql_12 = self.callPackage generic {
       version = "12.16";
       psqlSchema = "12";
diff --git a/pkgs/servers/sql/postgresql/ext/age.nix b/pkgs/servers/sql/postgresql/ext/age.nix
index c0de0c30d5a7..3a1c1c8388be 100644
--- a/pkgs/servers/sql/postgresql/ext/age.nix
+++ b/pkgs/servers/sql/postgresql/ext/age.nix
@@ -6,7 +6,6 @@ let
     "14" = "sha256-w93Q499sZRk4q85A9yqKQjGUd9Pl8UL8K1D3W7mHRTU=";
     "13" = "sha256-Sot7FR0oW7kWA680pNCMCmlflu4RfJTSWZn9mrXrpzw=";
     "12" = "sha256-XezcXoHHLCD1/2OHmKhxome2pdjOsYAfZlpvOoU3aS4=";
-    "11" = "sha256-ZkNAIMO69BxF3knQ+jcUBVuDgcoZXZccF5O+acpZ81M=";
   };
 in
 stdenv.mkDerivation rec {
diff --git a/pkgs/servers/sql/postgresql/ext/pg_hint_plan.nix b/pkgs/servers/sql/postgresql/ext/pg_hint_plan.nix
index d0cf1193fb56..afc5b9fe6506 100644
--- a/pkgs/servers/sql/postgresql/ext/pg_hint_plan.nix
+++ b/pkgs/servers/sql/postgresql/ext/pg_hint_plan.nix
@@ -22,10 +22,6 @@ let
       version = "1.3.9";
       hash = "sha256-64/dlm6e4flCxMQ8efsxfKSlja+Tko0zsghTgLatN+Y=";
     };
-    "11" = {
-      version = "1.3.9";
-      hash = "sha256-8t/HhB/2Kjx4xMItmmKv3g9gba5VCBHdplYtYD/3UhA=";
-    };
   }.${lib.versions.major postgresql.version} or (throw "Source for pg_hint_plan is not available for ${postgresql.version}");
 in
 stdenv.mkDerivation {
diff --git a/pkgs/servers/sql/postgresql/ext/pgaudit.nix b/pkgs/servers/sql/postgresql/ext/pgaudit.nix
index 188451f1b884..f4c03d611f50 100644
--- a/pkgs/servers/sql/postgresql/ext/pgaudit.nix
+++ b/pkgs/servers/sql/postgresql/ext/pgaudit.nix
@@ -22,10 +22,6 @@ let
       version = "1.4.3";
       hash = "sha256-c8/xUFIHalu2bMCs57DeylK0oW0VnQwmUCpdp+tYqk4=";
     };
-    "11" = {
-      version = "1.3.4";
-      hash = "sha256-UEnwD36ejeYWyKRHZ4mPt6/Ru76Gy8s/rgIvmgermiM=";
-    };
   }.${lib.versions.major postgresql.version} or (throw "Source for pgaudit is not available for ${postgresql.version}");
 in
 stdenv.mkDerivation {
diff --git a/pkgs/servers/sql/postgresql/ext/pipelinedb.nix b/pkgs/servers/sql/postgresql/ext/pipelinedb.nix
deleted file mode 100644
index 6403138fd704..000000000000
--- a/pkgs/servers/sql/postgresql/ext/pipelinedb.nix
+++ /dev/null
@@ -1,39 +0,0 @@
-{ lib, stdenv, fetchFromGitHub, postgresql, zeromq, openssl, libsodium, libkrb5 }:
-
-stdenv.mkDerivation rec {
-  pname = "pipelinedb";
-  version = "1.0.0-13";
-
-  src = fetchFromGitHub {
-    owner = "pipelinedb";
-    repo = pname;
-    rev = version;
-    sha256 = "1mnqpvx6g1r2n4kjrrx01vbdx7kvndfsbmm7zbzizjnjlyixz75f";
-  };
-
-  buildInputs = [ postgresql openssl zeromq libsodium libkrb5 ];
-
-  makeFlags = [ "USE_PGXS=1" ];
-
-  NIX_LDFLAGS = lib.optionalString stdenv.isDarwin "-lsodium";
-
-  preConfigure = ''
-    substituteInPlace Makefile \
-      --replace "/usr/lib/libzmq.a" "${zeromq}/lib/libzmq.a"
-  '';
-
-  installPhase = ''
-    mkdir -p $out/bin
-    install -D -t $out/lib/ pipelinedb.so
-    install -D -t $out/share/postgresql/extension {pipelinedb-*.sql,pipelinedb.control}
-  '';
-
-  meta = with lib; {
-    description = "High-performance time-series aggregation for PostgreSQL";
-    homepage = "https://www.pipelinedb.com/";
-    license = licenses.asl20;
-    platforms = postgresql.meta.platforms;
-    maintainers = [ maintainers.marsam ];
-    broken = versions.major postgresql.version != "11";
-  };
-}
diff --git a/pkgs/servers/sql/postgresql/packages.nix b/pkgs/servers/sql/postgresql/packages.nix
index d9d9ce8b09d9..09cba4ea81aa 100644
--- a/pkgs/servers/sql/postgresql/packages.nix
+++ b/pkgs/servers/sql/postgresql/packages.nix
@@ -56,8 +56,6 @@ self: super: {
 
     pgtap = super.callPackage ./ext/pgtap.nix { };
 
-    pipelinedb = super.callPackage ./ext/pipelinedb.nix { };
-
     smlar = super.callPackage ./ext/smlar.nix { };
 
     temporal_tables = super.callPackage ./ext/temporal_tables.nix { };
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 18e843038e0a..656bdf3a21d3 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -27080,14 +27080,12 @@ with pkgs;
   timescaledb-tune = callPackage ../development/tools/database/timescaledb-tune { };
 
   inherit (import ../servers/sql/postgresql pkgs)
-    postgresql_11
     postgresql_12
     postgresql_13
     postgresql_14
     postgresql_15
     postgresql_16
 
-    postgresql_11_jit
     postgresql_12_jit
     postgresql_13_jit
     postgresql_14_jit
@@ -27098,12 +27096,10 @@ with pkgs;
   postgresql_jit = postgresql_15_jit.override { this = postgresql_jit; };
   postgresqlPackages = recurseIntoAttrs postgresql.pkgs;
   postgresqlJitPackages = recurseIntoAttrs postgresql_jit.pkgs;
-  postgresql11Packages = recurseIntoAttrs postgresql_11.pkgs;
   postgresql12Packages = recurseIntoAttrs postgresql_12.pkgs;
   postgresql13Packages = recurseIntoAttrs postgresql_13.pkgs;
   postgresql14Packages = recurseIntoAttrs postgresql_14.pkgs;
   postgresql16Packages = recurseIntoAttrs postgresql_16.pkgs;
-  postgresql11JitPackages = recurseIntoAttrs postgresql_11_jit.pkgs;
   postgresql12JitPackages = recurseIntoAttrs postgresql_12_jit.pkgs;
   postgresql13JitPackages = recurseIntoAttrs postgresql_13_jit.pkgs;
   postgresql14JitPackages = recurseIntoAttrs postgresql_14_jit.pkgs;