diff --git a/config/pkg/ext/ext-decimal.yml b/config/pkg/ext/ext-decimal.yml
new file mode 100644
index 00000000..da541911
--- /dev/null
+++ b/config/pkg/ext/ext-decimal.yml
@@ -0,0 +1,16 @@
+ext-decimal:
+  type: php-extension
+  artifact:
+    source:
+      type: ghtagtar
+      repo: php-decimal/ext-decimal
+      match: 'v2\.\d.*'
+      extract: php-src/ext/decimal
+    metadata:
+      license-files: [LICENSE]
+      license: MIT
+  depends:
+    - libmpdec
+  php-extension:
+    arg-type@unix: '--enable-decimal --with-libmpdec-path=@build_root_path@'
+    arg-type@windows: '--with-decimal'
diff --git a/config/pkg/lib/libmpdec.yml b/config/pkg/lib/libmpdec.yml
new file mode 100644
index 00000000..adb9e531
--- /dev/null
+++ b/config/pkg/lib/libmpdec.yml
@@ -0,0 +1,15 @@
+libmpdec:
+  type: library
+  artifact:
+    source:
+      type: url
+      url: 'https://www.bytereef.org/software/mpdecimal/releases/mpdecimal-4.0.1.tar.gz'
+    metadata:
+      license-files: [COPYRIGHT.txt]
+      license: BSD-2-Clause
+  headers:
+    - mpdecimal.h
+  static-libs@unix:
+    - libmpdec.a
+  static-libs@windows:
+    - libmpdec_a.lib
diff --git a/src/Package/Extension/decimal.php b/src/Package/Extension/decimal.php
new file mode 100644
index 00000000..147f7388
--- /dev/null
+++ b/src/Package/Extension/decimal.php
@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Package\Extension;
+
+use Package\Target\php;
+use StaticPHP\Attribute\Package\BeforeStage;
+use StaticPHP\Attribute\Package\Extension;
+use StaticPHP\Attribute\PatchDescription;
+use StaticPHP\Package\PhpExtensionPackage;
+use StaticPHP\Util\FileSystem;
+
+#[Extension('decimal')]
+class decimal extends PhpExtensionPackage
+{
+    // TODO: remove this when https://github.com/php-decimal/ext-decimal/issues/92 is merged
+    #[BeforeStage('php', [php::class, 'buildconfForUnix'], 'ext-decimal')]
+    #[BeforeStage('php', [php::class, 'buildconfForWindows'], 'ext-decimal')]
+    #[PatchDescription('Fix decimal extension module entry symbol name conflict')]
+    public function patchBeforeBuildconf(): void
+    {
+        FileSystem::replaceFileStr(
+            $this->getSourceDir() . '/php_decimal.c',
+            'zend_module_entry decimal_module_entry',
+            'zend_module_entry php_decimal_module_entry'
+        );
+    }
+}
diff --git a/src/Package/Library/libmpdec.php b/src/Package/Library/libmpdec.php
new file mode 100644
index 00000000..05b2df04
--- /dev/null
+++ b/src/Package/Library/libmpdec.php
@@ -0,0 +1,46 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Package\Library;
+
+use StaticPHP\Attribute\Package\BuildFor;
+use StaticPHP\Attribute\Package\Library;
+use StaticPHP\Package\LibraryPackage;
+use StaticPHP\Runtime\Executor\UnixAutoconfExecutor;
+use StaticPHP\Util\FileSystem;
+
+#[Library('libmpdec')]
+class libmpdec
+{
+    #[BuildFor('Linux')]
+    #[BuildFor('Darwin')]
+    public function build(LibraryPackage $lib): void
+    {
+        UnixAutoconfExecutor::create($lib)
+            ->configure('--disable-cxx --disable-shared --enable-static')
+            ->make();
+    }
+
+    #[BuildFor('Windows')]
+    public function buildWin(LibraryPackage $lib): void
+    {
+        $makefileDir = $lib->getSourceDir() . DIRECTORY_SEPARATOR . 'libmpdec';
+
+        cmd()->cd($makefileDir)
+            ->exec('copy /y Makefile.vc Makefile')
+            ->exec('nmake /nologo clean')
+            ->exec('nmake /nologo MACHINE=x64');
+
+        // Copy static lib (rename from versioned name to libmpdec_a.lib)
+        $libs = glob($makefileDir . DIRECTORY_SEPARATOR . 'libmpdec-*.lib');
+        foreach ($libs as $libFile) {
+            if (!str_contains($libFile, '.dll.')) {
+                FileSystem::copy($libFile, $lib->getLibDir() . DIRECTORY_SEPARATOR . 'libmpdec_a.lib');
+                break;
+            }
+        }
+
+        FileSystem::copy($makefileDir . DIRECTORY_SEPARATOR . 'mpdecimal.h', $lib->getIncludeDir() . DIRECTORY_SEPARATOR . 'mpdecimal.h');
+    }
+}
diff --git a/src/globals/ext-tests/decimal.php b/src/globals/ext-tests/decimal.php
new file mode 100644
index 00000000..54f660fb
--- /dev/null
+++ b/src/globals/ext-tests/decimal.php
@@ -0,0 +1,10 @@
+<?php
+
+declare(strict_types=1);
+
+assert(class_exists('Decimal\Decimal'));
+assert(method_exists('Decimal\Decimal', 'valueOf'));
+assert(0.1 + 0.2 !== 0.3);
+$result = Decimal\Decimal::valueOf('0.1') + Decimal\Decimal::valueOf('0.2');
+$expected = Decimal\Decimal::valueOf('0.3');
+assert($result == $expected);