diff --git a/pkgs/development/compilers/flasm/default.nix b/pkgs/development/compilers/flasm/default.nix
new file mode 100644
index 000000000000..9393d4fc59f4
--- /dev/null
+++ b/pkgs/development/compilers/flasm/default.nix
@@ -0,0 +1,30 @@
+{ stdenv, fetchzip, unzip, bison, flex, gperf, zlib }:
+
+stdenv.mkDerivation rec {
+  pname = "flasm";
+  version = "1.64";
+
+  src = fetchzip {
+    url = "https://www.nowrap.de/download/flasm16src.zip";
+    sha256 = "03hvxm66rb6rjwbr07hc3k7ia5rim2xlhxbd9qmcai9xwmyiqafg";
+    stripRoot = false;
+  };
+
+  makeFlags = [ "CC=cc" ];
+
+  nativeBuildInputs = [ unzip bison flex gperf ];
+
+  buildInputs = [ zlib ];
+
+  installPhase = ''
+    install -Dm755 flasm -t $out/bin
+  '';
+
+  meta = with stdenv.lib; {
+    description = "Assembler and disassembler for Flash (SWF) bytecode";
+    homepage = "http://flasm.sourceforge.net/";
+    license = licenses.bsd2;
+    maintainers = with maintainers; [ siraben ];
+    platforms = platforms.all;
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index d0ffd9d20d2e..d0587fadab42 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -9033,6 +9033,8 @@ in
 
   fasmg = callPackage ../development/compilers/fasmg { };
 
+  flasm = callPackage ../development/compilers/flasm { };
+
   flyctl = callPackage ../development/web/flyctl { };
 
   flutterPackages =