diff --git a/pkgs/servers/sql/postgresql/ext/pg_graphql.nix b/pkgs/servers/sql/postgresql/ext/pg_graphql.nix
new file mode 100644
index 000000000000..36c6e5f4587e
--- /dev/null
+++ b/pkgs/servers/sql/postgresql/ext/pg_graphql.nix
@@ -0,0 +1,50 @@
+{
+  buildPgrxExtension,
+  cargo-pgrx_0_16_0,
+  fetchFromGitHub,
+  lib,
+  nix-update-script,
+  postgresql,
+}:
+buildPgrxExtension (finalAttrs: {
+  inherit postgresql;
+  cargo-pgrx = cargo-pgrx_0_16_0;
+
+  pname = "pg_graphql";
+  version = "1.5.12-unstable-2025-09-01";
+
+  src = fetchFromGitHub {
+    owner = "supabase";
+    repo = "pg_graphql";
+    # ToDo: 1.5.12 has not been tagged in Git yet, hence `rev` is used instead for now
+    #tag = "v${finalAttrs.version}";
+    rev = "bae1cb506d48d14ccf2b05f6a42331f3c9c71a76";
+    hash = "sha256-aJPstwzizWzVIo1N/4CHKgJBJ7DJpRkrwYrzNL+z7zQ=";
+  };
+
+  cargoHash = "sha256-Gfvu6YY+pRGrcAXAgEIa1iZKLJlbkvMv0F3pg3X/CXQ=";
+
+  # pgrx tests try to install the extension into postgresql nix store
+  doCheck = false;
+
+  passthru = {
+    updateScript = nix-update-script { };
+  };
+
+  meta = {
+    description = "GraphQL support for PostgreSQL";
+    homepage = "https://supabase.github.io/pg_graphql";
+    license = lib.licenses.asl20;
+    maintainers = with lib.maintainers; [ julm ];
+    broken =
+      lib.versionOlder postgresql.version "14"
+      || (
+        # ToDo: check after next package update.
+        lib.versionAtLeast postgresql.version "18"
+        && (
+          finalAttrs.version == "1.5.12-unstable-2025-09-01"
+          || lib.warn "Is postgresql18Packages.pg_graphql still broken?" false
+        )
+      );
+  };
+})