diff --git a/nix/arcanist.nix b/nix/arcanist.nix
new file mode 100644
--- /dev/null
+++ b/nix/arcanist.nix
@@ -0,0 +1,64 @@
+{ stdenv
+, lib
+, cacert
+, fetchFromGitHub
+, installShellFiles
+, makeWrapper
+, php80
+, python3
+, which
+}:
+
+stdenv.mkDerivation {
+  pname = "arcanist";
+  version = "20220517";
+
+  src = fetchFromGitHub {
+    owner = "phacility";
+    repo = "arcanist";
+    rev = "85c953ebe4a6fef332158fd757d97c5a58682d3a";
+    sha256 = "0x847fw74mzrbhzpgc4iqgvs6dsf4svwfa707dsbxi78fn2lxbl7";
+  };
+
+  # These need to be in PATH during the build
+  nativeBuildInputs = [ php80 python3 installShellFiles makeWrapper ];
+
+  # Since we are exporting a script, we do not need to do an actual "build"
+  doBuild = false;
+
+  installPhase = ''
+    # Copy arcanist contents
+    mkdir -p $out/libexec
+    cp -R . $out/libexec/arcanist
+
+    # provide a recent up-to-date certificate bundle for ssl
+    ln -sf ${cacert}/etc/ssl/certs/ca-bundle.crt \
+      $out/libexec/arcanist/resources/ssl/default.pem
+
+    # convert `#!/usr/bin/env php` into calling nixpkgs php interpreter
+    patchShebangs $out/libexec/arcanist/bin/arc
+
+    # Create a bin/arc which points to the real script, but provides
+    # assumptions such as the PATH including python3 and which
+    makeWrapper $out/libexec/arcanist/bin/arc $out/bin/arc \
+      --prefix PATH : ${lib.makeBinPath [ which python3 ]}
+
+    # Add shell completion for bash
+    $out/bin/arc shell-complete --generate --
+    installShellCompletion --cmd arc --bash \
+      $out/libexec/arcanist/support/shell/rules/bash-rules.sh
+  '';
+
+  # Ensure `arc` is able to run without failing
+  doInstallCheck = true;
+  installCheckPhase = ''
+    $out/bin/arc help diff -- > /dev/null
+  '';
+
+  meta = {
+    description = "Command line interface to Phabricator";
+    homepage = "http://phabricator.org";
+    license = lib.licenses.asl20;
+    platforms = lib.platforms.unix;
+  };
+}
diff --git a/nix/overlay.nix b/nix/overlay.nix
--- a/nix/overlay.nix
+++ b/nix/overlay.nix
@@ -13,6 +13,8 @@
   # add packages meant for just this repository
   amqp-cpp = prev.callPackage ./amqp-cpp.nix { };
 
+  arcanist = prev.callPackage ./arcanist.nix { };
+
   protobuf_3_15_cmake = prev.callPackage ./protobuf_3_15.nix { };
 
   devShell = final.callPackage ./dev-shell.nix { };