diff --git a/pkgs/by-name/as/async/package.nix b/pkgs/by-name/as/async/package.nix
deleted file mode 100644
index 8cd52c38cb5b..000000000000
--- a/pkgs/by-name/as/async/package.nix
+++ /dev/null
@@ -1,33 +0,0 @@
-{
-  lib,
-  fetchFromGitHub,
-  rustPlatform,
-}:
-
-rustPlatform.buildRustPackage rec {
-  pname = "async";
-  version = "0.1.1";
-
-  src = fetchFromGitHub {
-    owner = "ctbur";
-    repo = pname;
-    rev = "v${version}";
-    sha256 = "19ypflbayi5l0mb8yw7w0a4bq9a3w8nl9jsxapp9m3xggzmsvrxx";
-  };
-
-  cargoHash = "sha256-jIL7ZFzRMQuGLmMatGegkYRYctlsl3RRUfChgaIhWHg=";
-
-  meta = with lib; {
-    description = "Tool to parallelize shell commands";
-    mainProgram = "async";
-    longDescription = ''
-      `async` is a tool to run shell commands in parallel and is designed to be
-      able to quickly parallelize shell scripts with minimal changes. It was
-      inspired by GNU Parallel, with the main difference being that async
-      retains state between commands by running a server in the background.
-    '';
-    homepage = "https://github.com/ctbur/async";
-    license = licenses.gpl3Plus;
-    maintainers = with maintainers; [ minijackson ];
-  };
-}
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index a0db6ec6d3fb..c206664e0356 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -122,6 +122,7 @@ mapAliases {
   aria = aria2; # Added 2024-03-26
   armcord = throw "ArmCord was renamed to legcord by the upstream developers. Action is required to migrate configurations between the two applications. Please see this PR for more details: https://github.com/NixOS/nixpkgs/pull/347971"; # Added 2024-10-11
   aseprite-unfree = aseprite; # Added 2023-08-26
+  async = throw "'async' has been removed due to lack of upstream maintenance"; # Added 2025-01-26
   atlassian-bamboo = throw "Atlassian software has been removed, as support for the Atlassian Server products ended in February 2024 and there was insufficient interest in maintaining the Atlassian Data Center replacements"; # Added 2024-11-02
   atlassian-confluence = throw "Atlassian software has been removed, as support for the Atlassian Server products ended in February 2024 and there was insufficient interest in maintaining the Atlassian Data Center replacements"; # Added 2024-11-02
   atlassian-crowd = throw "Atlassian software has been removed, as support for the Atlassian Server products ended in February 2024 and there was insufficient interest in maintaining the Atlassian Data Center replacements"; # Added 2024-11-02