diff --git a/pkgs/applications/networking/browsers/castor/default.nix b/pkgs/applications/networking/browsers/castor/default.nix
new file mode 100644
index 000000000000..6209c3263bcd
--- /dev/null
+++ b/pkgs/applications/networking/browsers/castor/default.nix
@@ -0,0 +1,53 @@
+{ stdenv
+, fetchurl
+, rustPlatform
+, pkg-config
+, wrapGAppsHook
+, openssl
+, gtk3
+, gdk-pixbuf
+, pango
+, atk
+, cairo
+}:
+
+rustPlatform.buildRustPackage rec {
+  pname = "castor";
+  version = "0.8.14";
+
+  src = fetchurl {
+    url = "https://git.sr.ht/~julienxx/castor/archive/${version}.tar.gz";
+    sha256 = "1ykpmbimhfy3ys2hvv0mn8xiwxzdl43gpny1nc58i0gzv07ar8sc";
+  };
+
+  cargoSha256 = "04w49wka1vkb295lk6fzd6c5rwhzrqkp26hd5d94rx7bhcjmmb9w";
+  verifyCargoDeps = true;
+
+  nativeBuildInputs = [
+    pkg-config
+    wrapGAppsHook
+  ];
+
+  buildInputs = [
+    openssl
+    gtk3
+    gdk-pixbuf
+    pango
+    atk
+    cairo
+  ];
+
+  postInstall = "make PREFIX=$out copy-data";
+
+  # Sometimes tests fail when run in parallel
+  checkFlags = [ "--test-threads=1" ];
+
+  meta = with stdenv.lib; {
+    description = "A graphical client for plain-text protocols written in Rust with GTK. It currently supports the Gemini, Gopher and Finger protocols";
+    homepage = "https://sr.ht/~julienxx/Castor";
+    license = licenses.mit;
+    platforms = platforms.all;
+    maintainers = with maintainers; [ fgaz ];
+  };
+}
+
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 6ed191d2abb6..0a0bb8018efe 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -19002,6 +19002,8 @@ in
 
   carla = qt5.callPackage ../applications/audio/carla { };
 
+  castor = callPackage ../applications/networking/browsers/castor { };
+
   catimg = callPackage ../tools/misc/catimg { };
 
   catt = python3Packages.callPackage ../applications/video/catt { };