diff --git a/sci-libs/libROM/Manifest b/sci-libs/libROM/Manifest
new file mode 100644
index 0000000000..10d16ef366
--- /dev/null
+++ b/sci-libs/libROM/Manifest
@@ -0,0 +1 @@
+DIST libROM-1.0.0.tar.gz 1402421 BLAKE2B 73be693241751a3e1d99f3a9229a07c1776c77edd4c2d809cce431f187c8385d5967a0747f4a481cf7001a65453bb74395b1d9861621b6386e63a9712f01a86c SHA512 8c79d3fac4df284753af2816ad08ba1c0b7f306788a6ae8dfdb321c3e8bd9bf1cf458e797b84ece134ceaa341fb11470eee41e151fa308d363335b902d38bda2
diff --git a/sci-libs/libROM/libROM-1.0.0.ebuild b/sci-libs/libROM/libROM-1.0.0.ebuild
new file mode 100644
index 0000000000..a914694e27
--- /dev/null
+++ b/sci-libs/libROM/libROM-1.0.0.ebuild
@@ -0,0 +1,73 @@
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit cmake fortran-2
+
+DESCRIPTION="Library for reduced order models"
+HOMEPAGE="
+	https://www.librom.net/
+	https://github.com/LLNL/libROM
+"
+SRC_URI="https://github.com/LLNL/${PN}/archive/refs/tags/v${PV}.tar.gz -> ${P}.tar.gz"
+
+KEYWORDS="~amd64"
+LICENSE="|| ( Apache-2.0 MIT )"
+SLOT="0"
+IUSE="mfem"
+
+RDEPEND="
+	sci-libs/hdf5:=
+	sci-libs/scalapack
+	sys-libs/zlib
+	virtual/blas
+	virtual/lapack
+	virtual/mpi[cxx]
+
+	mfem? (
+		sci-libs/hypre[mpi]
+		sci-libs/metis
+		sci-libs/mfem[mpi]
+		sci-libs/parmetis
+	)
+"
+DEPEND="
+	${RDEPEND}
+	dev-cpp/gtest
+"
+BDEPEND="app-doc/doxygen"
+
+DOCS=( README.md CHANGELOG docs/libROM_Design_and_Theory.pdf )
+
+src_configure() {
+	local mycmakeargs=(
+		-DBUILD_STATIC=OFF
+		-DUSE_MFEM=OFF
+	)
+	cmake_src_configure
+}
+
+src_install() {
+	insinto "/usr/include/${PN}"
+	doins lib/*.h
+	insinto "/usr/include/${PN}/utils"
+	doins lib/utils/*.h
+	insinto "/usr/include/${PN}/linalg"
+	doins lib/linalg/*.h
+	insinto "/usr/include/${PN}/linalg/svd"
+	doins lib/linalg/svd/*.h
+	insinto "/usr/include/${PN}/algo"
+	doins lib/algo/*.h
+	insinto "/usr/include/${PN}/algo/manifold_interp"
+	doins lib/algo/manifold_interp/*.h
+	insinto "/usr/include/${PN}/algo/greedy"
+	doins lib/algo/greedy/*.h
+	insinto "/usr/include/${PN}/hyperreduction"
+	doins lib/hyperreduction/*.h
+	insinto "/usr/include/${PN}/mfem"
+	doins lib/mfem/*.hpp
+	dolib.so "${BUILD_DIR}/lib/libROM.so"
+	einstalldocs
+	dodoc -r docs/html
+}
diff --git a/sci-libs/libROM/metadata.xml b/sci-libs/libROM/metadata.xml
new file mode 100644
index 0000000000..f6a60eca63
--- /dev/null
+++ b/sci-libs/libROM/metadata.xml
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+    <maintainer type="person">
+        <email>lssndrbarbieri@gmail.com</email>
+        <name>Alessandro Barbieri</name>
+    </maintainer>
+    <upstream>
+        <bugs-to>https://github.com/LLNL/libROM/issues</bugs-to>
+        <remote-id type="github">LLNL/libROM</remote-id>
+    </upstream>
+    <use>
+        <flag name="mfem">Build libROM with MFEM</flag>
+    </use>
+</pkgmetadata>