diff --git a/dev-ml/msgpck/Manifest b/dev-ml/msgpck/Manifest
new file mode 100644
index 0000000..62d6053
--- /dev/null
+++ b/dev-ml/msgpck/Manifest
@@ -0,0 +1 @@
+DIST msgpck-1.7.tbz 9860 BLAKE2B b74f957f8c671c6015508b442f51d341a390d8aca6c564a114e33235150d9cb4d8baafc45724dff986416eb55949a5a2ba62bd4c71c4ad672279b3cce8f662f1 SHA512 7d71baa9614f890f669bb52181a295e51d6735ab9786fd7bc69c123721f801232a314ec98b8e59ccf8d2c1541f8fcc084ebf1d47189fd45632621c4a246d0368
diff --git a/dev-ml/msgpck/metadata.xml b/dev-ml/msgpck/metadata.xml
new file mode 100644
index 0000000..4050502
--- /dev/null
+++ b/dev-ml/msgpck/metadata.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="person">
+		<email>shinyoukai@laidback.moe</email>
+		<name>Shin'ya Minazuki</name>
+	</maintainer>
+	<upstream>
+		<remote-id type="github">vbmithr/ocaml-msgpck</remote-id>
+		<bugs-to>https://github.com/vbmithr/ocaml-msgpck</bugs-to>
+	</upstream>
+</pkgmetadata>
diff --git a/dev-ml/msgpck/msgpck-1.7.ebuild b/dev-ml/msgpck/msgpck-1.7.ebuild
new file mode 100644
index 0000000..92b09d2
--- /dev/null
+++ b/dev-ml/msgpck/msgpck-1.7.ebuild
@@ -0,0 +1,21 @@
+# Copyright 2026 Shin'ya Minazuki
+
+EAPI=8
+
+inherit dune
+
+DESCRIPTION="Fast MessagePack library"
+HOMEPAGE="https://opam.ocaml.org/packages/msgpck https://github.com/vbmithr/ocaml-msgpck"
+SRC_URI="https://github.com/vbmithr/ocaml-msgpck/releases/download/${PV}/msgpck-v${PV}.tbz -> ${P}.tbz"
+
+S="${WORKDIR}/${PN}-v${PV}"
+
+LICENSE="ISC"
+SLOT="0"
+KEYWORDS="~amd64"
+
+DEPEND="dev-ml/ocplib-endian"
+BDEPEND="${DEPEND}"
+RDEPEND="${DEPEND}"
+
+IUSE="ocamlopt"