diff --git a/dev-libs/c-blosc2/Manifest b/dev-libs/c-blosc2/Manifest
index 6b5175a69b14b..d9ee74ed21a1a 100644
--- a/dev-libs/c-blosc2/Manifest
+++ b/dev-libs/c-blosc2/Manifest
@@ -1 +1,3 @@
 DIST c-blosc2-2.23.1.gh.tar.gz 3338640 BLAKE2B 528b4b87d2b8e29648de131b1d01a62402dbfd582e141b7933fa1faaf102aa6bcd5e4348e54a6bed7ac3046866e5a2bee8a808a14ad38c50d1ca310a59d692b2 SHA512 c6dd74c6f31649d361395b4817a2ca2e0da5353c5cd3ef7ce5f3969251b3393aaf3c2941cc77dd41a9672efb8acc7f68a9e5e8acf86b978123eed13a1225f827
+DIST c-blosc2-3.0.0.gh.tar.gz 1823736 BLAKE2B c23bc88288f07903344da86117576fb29f5a2085d5c6d16a466b7152e7edbf47a1c4862d4ffa7e06bff48a75b03276a6748729ede65f623718a7659a09a14607 SHA512 d6d85682f2d9c269ca896e7fc893d32c226634008f61b6078200d484a168730251545ed01f011980152d8d4b5bec9f8ed0a365abe251de4459d51e81ceadc733
+DIST zfp-1.0.1.gh.tar.gz 508016 BLAKE2B 6911402dd70fa423ac0a3add54229e2603530c9444534da603e08c078c2a8087c78989f113756e4388b00e17ebb7fe92fb7e98f43fca837eaaa8c728cb2d41da SHA512 5bbd98ed2f98e75c654afa863cab3023abb2eeb8f203f9049c75d5dbdf4b364cfb5c8378e10e6aaeaf13242315ad4949b06619810a67b3adaed095b7e8a48d5a
diff --git a/dev-libs/c-blosc2/c-blosc2-3.0.0.ebuild b/dev-libs/c-blosc2/c-blosc2-3.0.0.ebuild
new file mode 100644
index 0000000000000..5d8103d603e71
--- /dev/null
+++ b/dev-libs/c-blosc2/c-blosc2-3.0.0.ebuild
@@ -0,0 +1,70 @@
+# Copyright 1999-2026 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit cmake
+
+ZFP_PV=1.0.1
+ZFP_P=zfp-${ZFP_PV}
+
+DESCRIPTION="Blocking, shuffling and lossless compression library"
+HOMEPAGE="
+	https://blosc.org/c-blosc2/c-blosc2.html
+	https://github.com/Blosc/c-blosc2/
+"
+SRC_URI="
+	https://github.com/Blosc/c-blosc2/archive/v${PV}.tar.gz
+		-> ${P}.gh.tar.gz
+	https://github.com/LLNL/zfp/archive/${ZFP_PV}.tar.gz
+		-> ${ZFP_P}.gh.tar.gz
+"
+
+LICENSE="BSD"
+SLOT="0/8"
+KEYWORDS="~amd64 ~arm ~arm64 ~hppa ~loong ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86"
+IUSE="test +zlib +zstd"
+REQUIRED_USE="test? ( zlib zstd )"
+RESTRICT="!test? ( test )"
+
+DEPEND="
+	>=app-arch/lz4-1.7.5:=
+	zlib? ( virtual/zlib:= )
+	zstd? ( app-arch/zstd:= )
+"
+RDEPEND="
+	${DEPEND}
+"
+
+# Tests fail in parallel, https://github.com/Blosc/c-blosc2/issues/432
+CTEST_JOBS=1
+
+src_configure() {
+	# remove bundled libs (just in case)
+	rm -rf internal-complibs || die
+
+	local mycmakeargs=(
+		-DBUILD_STATIC=OFF
+		-DBUILD_TESTS=$(usex test)
+		-DBUILD_BENCHMARKS=OFF
+		-DBUILD_EXAMPLES=OFF
+		-DBUILD_FUZZERS=OFF
+		-DDEACTIVATE_ZLIB=$(usex !zlib)
+		-DDEACTIVATE_ZSTD=$(usex !zstd)
+		-DPREFER_EXTERNAL_LZ4=ON
+		-DPREFER_EXTERNAL_ZLIB=ON
+		-DPREFER_EXTERNAL_ZSTD=ON
+		# TODO: unbundle? make plugins optional?
+		-DBLOSC_ZFP_SOURCE_DIR="${WORKDIR}/${ZFP_P}"
+
+		# force regular zlib, at least for  the time being
+		-DCMAKE_DISABLE_FIND_PACKAGE_ZLIB_NG=ON
+
+		# upstream overrides CMAKE_C_FLAGS, preventing ${CFLAGS} defaults
+		# from applying, https://github.com/Blosc/c-blosc2/issues/433
+		-DCMAKE_C_FLAGS="${CFLAGS}"
+		# why do we need to pass it explicitly?
+		-DCMAKE_INSTALL_INCLUDEDIR=include
+	)
+	cmake_src_configure
+}