diff --git a/pkgs/development/tools/parsing/tree-sitter/grammars/default.nix b/pkgs/development/tools/parsing/tree-sitter/grammars/default.nix
index 070dc6279edb..48f4d4196bd3 100644
--- a/pkgs/development/tools/parsing/tree-sitter/grammars/default.nix
+++ b/pkgs/development/tools/parsing/tree-sitter/grammars/default.nix
@@ -26,6 +26,7 @@
   tree-sitter-elm = lib.importJSON ./tree-sitter-elm.json;
   tree-sitter-embedded-template = lib.importJSON ./tree-sitter-embedded-template.json;
   tree-sitter-erlang = lib.importJSON ./tree-sitter-erlang.json;
+  tree-sitter-factor = lib.importJSON ./tree-sitter-factor.json;
   tree-sitter-fennel = lib.importJSON ./tree-sitter-fennel.json;
   tree-sitter-fish = lib.importJSON ./tree-sitter-fish.json;
   tree-sitter-fortran = lib.importJSON ./tree-sitter-fortran.json;
diff --git a/pkgs/development/tools/parsing/tree-sitter/grammars/tree-sitter-factor.json b/pkgs/development/tools/parsing/tree-sitter/grammars/tree-sitter-factor.json
new file mode 100644
index 000000000000..0241833bbf3d
--- /dev/null
+++ b/pkgs/development/tools/parsing/tree-sitter/grammars/tree-sitter-factor.json
@@ -0,0 +1,12 @@
+{
+  "url": "https://github.com/erochest/tree-sitter-factor",
+  "rev": "554d8b705df61864eb41a0ecf3741e94eb9f0c54",
+  "date": "2025-01-11T21:45:26-05:00",
+  "path": "/nix/store/yvyrq221kqwjq19hw6lf8xzxj6z080d8-tree-sitter-factor",
+  "sha256": "14yciinyczi7h8dny0cgk5ghlfwjlgz1zqndwrk260n1994k5bb7",
+  "hash": "sha256-Z60ySUrBAiNm5s3iH/6jkjsKX5mPAW8bgid+5m2MzJM=",
+  "fetchLFS": false,
+  "fetchSubmodules": false,
+  "deepClone": false,
+  "leaveDotGit": false
+}
diff --git a/pkgs/development/tools/parsing/tree-sitter/update.nix b/pkgs/development/tools/parsing/tree-sitter/update.nix
index 57db52ae2fa8..e1b56866ba44 100644
--- a/pkgs/development/tools/parsing/tree-sitter/update.nix
+++ b/pkgs/development/tools/parsing/tree-sitter/update.nix
@@ -155,6 +155,10 @@ let
       orga = "MunifTanjim";
       repo = "tree-sitter-lua";
     };
+    "tree-sitter-factor" = {
+      orga = "erochest";
+      repo = "tree-sitter-factor";
+    };
     "tree-sitter-fennel" = {
       orga = "travonted";
       repo = "tree-sitter-fennel";