diff --git a/docs/manual/release-notes/rl-0.9.md b/docs/manual/release-notes/rl-0.9.md
index ffdccb8e..fe4990bc 100644
--- a/docs/manual/release-notes/rl-0.9.md
+++ b/docs/manual/release-notes/rl-0.9.md
@@ -388,6 +388,8 @@
 
 - Fix `languages.ts` registration of formatters.
 
+- Added `asmfmt` and `nasmfmt` formatters to `languages.asm`.
+
 - Added `biome-check` and `biome-organize-imports` formatters to `languages.ts`.
 
 - Added [`biomejs`](https://biomejs.dev/) as extra diagnostics provider to
diff --git a/modules/plugins/languages/asm.nix b/modules/plugins/languages/asm.nix
index 41b9f4bd..fbed0e93 100644
--- a/modules/plugins/languages/asm.nix
+++ b/modules/plugins/languages/asm.nix
@@ -4,15 +4,37 @@
   lib,
   ...
 }: let
-  inherit (lib.options) mkEnableOption mkOption literalExpression;
-  inherit (lib.modules) mkIf mkMerge;
-  inherit (lib.types) enum listOf;
+  inherit (builtins) attrNames;
   inherit (lib) genAttrs;
+  inherit (lib.generators) mkLuaInline;
+  inherit (lib.meta) getExe;
+  inherit (lib.modules) mkIf mkMerge;
+  inherit (lib.nvim.attrsets) mapListToAttrs;
   inherit (lib.nvim.types) mkGrammarOption;
+  inherit (lib.options) mkEnableOption mkOption literalExpression;
+  inherit (lib.types) enum listOf;
 
   cfg = config.vim.languages.assembly;
   defaultServers = ["asm-lsp"];
   servers = ["asm-lsp"];
+
+  defaultFormat = ["asmfmt"];
+  formats = {
+    asmfmt = {
+      command = getExe pkgs.asmfmt;
+    };
+    nasmfmt = {
+      command = getExe pkgs.nasmfmt;
+      args = mkLuaInline ''
+        function(self, ctx)
+          return {
+            "--ii", ctx.shiftwidth,
+            "$FILENAME",
+          }
+        end
+      '';
+    };
+  };
 in {
   options.vim.languages.assembly = {
     enable = mkEnableOption "Assembly support";
@@ -42,6 +64,20 @@ in {
         description = "Assembly LSP server to use";
       };
     };
+
+    format = {
+      enable =
+        mkEnableOption "Assembly formatting"
+        // {
+          default = config.vim.languages.enableFormat;
+          defaultText = literalExpression "config.vim.languages.enableFormat";
+        };
+      type = mkOption {
+        type = listOf (enum (attrNames formats));
+        default = defaultFormat;
+        description = "Assembly formatter to use";
+      };
+    };
   };
   config = mkIf cfg.enable (mkMerge [
     (mkIf cfg.treesitter.enable {
@@ -57,9 +93,43 @@ in {
       vim.lsp = {
         presets = genAttrs cfg.lsp.servers (_: {enable = true;});
         servers = genAttrs cfg.lsp.servers (_: {
-          filetypes = ["asm" "nasm" "masm" "vmasm" "fasm" "tasm" "tiasm" "asm68k" "asm8300"];
+          filetypes = [
+            "asm"
+            "nasm"
+            "masm"
+            "vmasm"
+            "fasm"
+            "tasm"
+            "tiasm"
+            "asm68k"
+            "asmh8300"
+          ];
         });
       };
     })
+
+    (mkIf cfg.format.enable {
+      vim.formatter.conform-nvim = {
+        enable = true;
+        setupOpts = {
+          formatters_by_ft = {
+            asm = cfg.format.type;
+            nasm = cfg.format.type;
+            masm = cfg.format.type;
+            vmasm = cfg.format.type;
+            tasm = cfg.format.type;
+            tiasm = cfg.format.type;
+            asm68k = cfg.format.type;
+            asmh8300 = cfg.format.type;
+          };
+          formatters =
+            mapListToAttrs (name: {
+              inherit name;
+              value = formats.${name};
+            })
+            cfg.format.type;
+        };
+      };
+    })
   ]);
 }