diff --git a/dev-ruby/zstd-ruby/Manifest b/dev-ruby/zstd-ruby/Manifest
new file mode 100644
index 0000000000000..042eadc59b1d6
--- /dev/null
+++ b/dev-ruby/zstd-ruby/Manifest
@@ -0,0 +1 @@
+DIST zstd-ruby-1.5.6.6.tar.gz 1956988 BLAKE2B 66e9d5e077dd9a721f185c61f5859a12e1b6b57144a413f5e7875121d5d475fa5d349c57bcfd5b8b8f696b7e87a8423b9756ef15a3ba7fbbbf3463dda4320c65 SHA512 396264d16f9c66ec1edd1db9a99b08d31a7ad71c19dbbc61abd5c4e21b957c87ca1c3daedaebbf22098f8ae544de12331b79ffe06548a5cdbdd199141c9f9984
diff --git a/dev-ruby/zstd-ruby/metadata.xml b/dev-ruby/zstd-ruby/metadata.xml
new file mode 100644
index 0000000000000..2f5ac81a40cc5
--- /dev/null
+++ b/dev-ruby/zstd-ruby/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="project">
+    <email>ruby@gentoo.org</email>
+    <name>Gentoo Ruby Project</name>
+  </maintainer>
+  <upstream>
+    <remote-id type="github">SpringMT/zstd-ruby</remote-id>
+    <remote-id type="rubygems">zstd-ruby</remote-id>
+  </upstream>
+</pkgmetadata>
diff --git a/dev-ruby/zstd-ruby/zstd-ruby-1.5.6.6.ebuild b/dev-ruby/zstd-ruby/zstd-ruby-1.5.6.6.ebuild
new file mode 100644
index 0000000000000..0f0e3260bec38
--- /dev/null
+++ b/dev-ruby/zstd-ruby/zstd-ruby-1.5.6.6.ebuild
@@ -0,0 +1,41 @@
+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+USE_RUBY="ruby31 ruby32 ruby33"
+
+# This gem includes a bundled version of app-arch/zstd. It requires
+# features that are only available with a statically linked zstd library
+# (e.g. ZSTD_SKIPPABLEHEADERSIZE) and changing the build system to build
+# against a statically linked app-arch/zstd does not seem worth it.
+
+RUBY_FAKEGEM_BINWRAP=""
+RUBY_FAKEGEM_EXTRADOC="README.md"
+RUBY_FAKEGEM_EXTENSIONS=(ext/zstdruby/extconf.rb)
+RUBY_FAKEGEM_EXTENSION_LIBDIR="lib/zstd-ruby"
+RUBY_FAKEGEM_GEMSPEC="zstd-ruby.gemspec"
+RUBY_FAKEGEM_RECIPE_TEST="rspec3"
+
+inherit ruby-fakegem
+
+DESCRIPTION="Ruby binding for zstd (Zstandard - Fast real-time compression algorithm)."
+HOMEPAGE="https://github.com/SpringMT/zstd-ruby"
+SRC_URI="https://github.com/SpringMT/zstd-ruby/archive/refs/tags/v${PV}.tar.gz -> ${P}.tar.gz"
+
+LICENSE="BSD"
+SLOT="$(ver_cut 1)"
+KEYWORDS="~amd64"
+
+all_ruby_prepare() {
+	sed -e 's/git ls-files -z/find * -print0/' \
+		-i ${RUBY_FAKEGEM_GEMSPEC}
+
+	# Removing the -O3 optimization flag causes the test suite to hang
+	# consuming CPU.
+	# sed -e '/CFLAGS/ s/-O3//' \ -i
+	# ext/zstdruby/extconf.rb || die
+
+	sed -e '/bundler/ s:^:#:' \
+		-i spec/spec_helper.rb || die
+}