diff --git a/pkgs/development/libraries/proj/5.2.nix b/pkgs/development/libraries/proj/5.2.nix
deleted file mode 100644
index ee76c668716c..000000000000
--- a/pkgs/development/libraries/proj/5.2.nix
+++ /dev/null
@@ -1,20 +0,0 @@
-{ lib, stdenv, fetchurl }:
-
-stdenv.mkDerivation {
-  name = "proj-5.2.0";
-
-  src = fetchurl {
-    url = "https://download.osgeo.org/proj/proj-5.2.0.tar.gz";
-    sha256 = "0q3ydh2j8qhwlxmnac72pg69rw2znbi5b6k5wama8qmwzycr94gg";
-  };
-
-  doCheck = stdenv.is64bit;
-
-  meta = with lib; {
-    description = "Cartographic Projections Library";
-    homepage = "https://proj4.org";
-    license = licenses.mit;
-    platforms = platforms.linux ++ platforms.darwin;
-    maintainers = with maintainers; [ vbgl ];
-  };
-}
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index 720d2dcdd9e2..0bc2c3248048 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -577,6 +577,7 @@ mapAliases ({
   ppl-address-book = throw "ppl-address-book deprecated on 2019-05-02: abandoned by upstream.";
   processing3 = processing; # added 2019-08-16
   procps-ng = procps; # added 2018-06-08
+  proj_5 = throw "Proj-5 has been removed from nixpkgs, use proj instead."; # added 2021-04-12
   prometheus-cups-exporter = throw "outdated and broken by design; removed by developer."; # added 2021-03-16
   pygmentex = texlive.bin.pygmentex; # added 2019-12-15
   pyload = throw "pyload has been removed from nixpkgs, as it was unmaintained."; # added 2021-03-21
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 32c6eb4ee80b..5795aff96edb 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -16843,8 +16843,6 @@ in
 
   proj = callPackage ../development/libraries/proj { };
 
-  proj_5 = callPackage ../development/libraries/proj/5.2.nix { };
-
   proj-datumgrid = callPackage ../development/libraries/proj-datumgrid { };
 
   proselint = callPackage ../tools/text/proselint {