diff --git a/.github/workflows/mlir.yaml b/.github/workflows/mlir.yaml
new file mode 100644
index 00000000..f4b754b4
--- /dev/null
+++ b/.github/workflows/mlir.yaml
@@ -0,0 +1,33 @@
+name: MLIR
+
+on: workflow_dispatch
+
+jobs:
+  build-mlir-emscripten:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup emscripten cache
+        uses: actions/cache@v4
+        with:
+          path: ~/.emscripten-cache
+          key: ${{ runner.os }}-emscripten
+          restore-keys: |
+            ${{ runner.os }}-emscripten
+
+      - name: Install dependencies
+        run: |
+          npm ci
+
+      - name: Build
+        run: |
+          npm run build:mlir
+
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: mlir
+          path: |
+            build.em/llvm-project/install/
diff --git a/CMakePresets.json b/CMakePresets.json
index 6fe5bd67..4dd516b3 100644
--- a/CMakePresets.json
+++ b/CMakePresets.json
@@ -43,6 +43,29 @@
         "rhs": ""
       }
     },
+    {
+      "name": "emscripten-mlir",
+      "displayName": "emscripten with MLIR",
+      "generator": "Ninja",
+      "binaryDir": "${sourceDir}/build.em",
+      "toolchainFile": "$env{EMSCRIPTEN_ROOT}/cmake/Modules/Platform/Emscripten.cmake",
+      "cacheVariables": {
+        "CMAKE_EXPORT_COMPILE_COMMANDS": "YES",
+        "CMAKE_BUILD_TYPE": "Release",
+        "CMAKE_INSTALL_PREFIX": "${sourceDir}/build.em/install/usr",
+        "CMAKE_INTERPROCEDURAL_OPTIMIZATION": "YES",
+        "CXX_ENABLE_FLATBUFFERS": "NO",
+        "CXX_INSTALL_WASI_SYSROOT": "YES",
+        "CXX_ENABLE_MLIR": "YES",
+        "LLVM_DIR": "${sourceDir}/build.em/llvm-project/install/lib/cmake/llvm",
+        "MLIR_DIR": "${sourceDir}/build.em/llvm-project/install/lib/cmake/mlir"
+      },
+      "condition": {
+        "type": "notEquals",
+        "lhs": "$env{EMSCRIPTEN_ROOT}",
+        "rhs": ""
+      }
+    },
     {
       "name": "wasi",
       "displayName": "wasi",
diff --git a/package.json b/package.json
index 7ef96ab9..de131543 100644
--- a/package.json
+++ b/package.json
@@ -35,6 +35,7 @@
     "build:storybook": "npm run build-storybook -w @robertoraggi/cxx-storybook",
     "build:emscripten": "npm run build -w cxx-frontend",
     "build:wasi": "zx scripts/build-wasi.mjs",
+    "build:mlir": "zx scripts/build-mlir.mjs",
     "storybook": "npm run storybook -w @robertoraggi/cxx-storybook",
     "setup-venv": "zx scripts/setup-venv.mjs",
     "update-tests": "zx scripts/update-tests.mjs",
diff --git a/scripts/build-mlir.mjs b/scripts/build-mlir.mjs
new file mode 100644
index 00000000..58378f73
--- /dev/null
+++ b/scripts/build-mlir.mjs
@@ -0,0 +1,161 @@
+// Copyright (c) 2025 Roberto Raggi <roberto.raggi@gmail.com>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+import * as zx from "zx";
+import { $ } from "zx";
+
+$.verbose = true;
+
+async function download({ pkg, version, outdir = "." }) {
+  const baseUrl = `https://github.com/llvm/llvm-project/releases/download/llvmorg-${version}/`;
+  const fileName = `${pkg}-${version}.src.tar.xz`;
+  const exists = await zx.fs.exists(zx.path.join(outdir, fileName));
+  if (!exists) {
+    const url = `${baseUrl}${fileName}`;
+    const response = await zx.fetch(url);
+    if (!response.ok) {
+      throw new Error(`Failed to download ${url}: ${response.statusText}`);
+    }
+    const payload = await response.arrayBuffer();
+    await zx.fs.writeFile(zx.path.join(outdir, fileName), Buffer.from(payload));
+  }
+
+  // unpack
+  if (!(await zx.fs.exists(zx.path.join(outdir, pkg)))) {
+    await zx.fs.mkdir(zx.path.join(outdir, pkg), { recursive: true });
+    await $`tar jxf ${outdir}/${fileName} -C ${outdir}/${pkg} --strip-components=1`.quiet();
+  }
+}
+
+async function downloadLLVM({ packages, version, outdir }) {
+  for (const pkg of packages) {
+    await download({ pkg, version, outdir });
+  }
+}
+
+async function main() {
+  const version = "20.1.2";
+  const packages = ["cmake", "third-party", "llvm", "mlir"];
+
+  const llvm_source_dir = zx.path.resolve(
+    zx.path.join("build.em", "llvm-project")
+  );
+
+  const llvm_build_dir = zx.path.resolve(
+    zx.path.join("build.em", "llvm-project", "build")
+  );
+
+  const llvm_install_dir = zx.path.resolve(
+    zx.path.join("build.em", "llvm-project", "install")
+  );
+
+  const llvm_cmake_options = [
+    "-G",
+    "Ninja",
+    "-DCMAKE_BUILD_TYPE=Release",
+    "-DCMAKE_CXX_FLAGS=-DLLVM_BUILD_STATIC",
+    "-DCMAKE_EXE_LINKER_FLAGS=-sNODERAWFS -sEXIT_RUNTIME -sALLOW_MEMORY_GROWTH",
+    "-DCMAKE_EXPORT_COMPILE_COMMANDS=ON",
+    "-DLLVM_BUILD_EXTERNAL_COMPILER_RT=OFF",
+    "-DLLVM_BUILD_TOOLS=OFF",
+    "-DLLVM_ENABLE_EH=OFF",
+    "-DLLVM_ENABLE_FFI=OFF",
+    "-DLLVM_ENABLE_PROJECTS=mlir",
+    "-DLLVM_ENABLE_RTTI=OFF",
+    "-DLLVM_ENABLE_RUNTIMES=",
+    "-DLLVM_ENABLE_Z3_SOLVER=OFF",
+    "-DLLVM_INCLUDE_DOCS=OFF",
+    "-DLLVM_INCLUDE_TESTS=OFF",
+    "-DLLVM_INSTALL_UTILS=OFF",
+    "-DLLVM_LINK_LLVM_DYLIB=OFF",
+    "-DLLVM_OPTIMIZED_TABLEGEN=OFF",
+    "-DLLVM_TARGETS_TO_BUILD=WebAssembly",
+  ];
+
+  await zx.fs.mkdir(llvm_source_dir, { recursive: true });
+  await zx.fs.mkdir(llvm_build_dir, { recursive: true });
+  await zx.fs.mkdir(llvm_install_dir, { recursive: true });
+
+  await zx.fs.mkdir(llvm_source_dir, { recursive: true });
+  await zx.fs.writeFile(zx.path.join(llvm_source_dir, ".gitignore"), "*");
+
+  await downloadLLVM({ version, packages, outdir: llvm_source_dir });
+
+  await $`emcmake cmake ${llvm_cmake_options} -S ${llvm_source_dir}/llvm -B ${llvm_build_dir}/llvm -DCMAKE_INSTALL_PREFIX=${llvm_install_dir}`;
+
+  await $`cmake --build ${llvm_build_dir}/llvm --target install`;
+
+  // fixup installation
+
+  const executables = [
+    "llvm-tblgen",
+    "mlir-pdll",
+    "mlir-tblgen",
+    "tblgen-to-irdl",
+  ];
+
+  // copy wasm payloads and create stubs for the executables
+  for (const app of executables) {
+    await zx.fs.copyFile(
+      zx.path.join(llvm_build_dir, "llvm", "bin", app + ".wasm"),
+      zx.path.join(llvm_install_dir, "bin", app + ".wasm")
+    );
+
+    await zx.fs.writeFile(
+      zx.path.join(llvm_install_dir, "bin", app),
+      `#!/usr/bin/env node\nrequire("./${app}.js");`
+    );
+
+    await zx.fs.chmod(zx.path.join(llvm_install_dir, "bin", app), 0o755);
+  }
+
+  // fixup
+  const cmake_files = [
+    zx.path.join(
+      llvm_install_dir,
+      "lib",
+      "cmake",
+      "llvm",
+      "LLVMExports-release.cmake"
+    ),
+
+    zx.path.join(
+      llvm_install_dir,
+      "lib",
+      "cmake",
+      "mlir",
+      "MLIRTargets-release.cmake"
+    ),
+  ];
+
+  // replace .js with "" in the cmake files
+  for (const file of cmake_files) {
+    // replace .js with ""
+    const content = await zx.fs.readFile(file, "utf8");
+    const newContent = content.replace(/\.js/g, "");
+    await zx.fs.writeFile(file, newContent);
+  }
+}
+
+try {
+  await main();
+} catch (e) {
+  console.error(e.message);
+}