diff --git a/science/Makefile b/science/Makefile
index d9f958844f24..fd813b9d88e6 100644
--- a/science/Makefile
+++ b/science/Makefile
@@ -298,6 +298,7 @@
     SUBDIR += py-asdf
     SUBDIR += py-asdf-standard
     SUBDIR += py-asdf-transform-schemas
+    SUBDIR += py-asdf-unit-schemas
     SUBDIR += py-ase
     SUBDIR += py-atomium
     SUBDIR += py-avogadrolibs
diff --git a/science/py-asdf-unit-schemas/Makefile b/science/py-asdf-unit-schemas/Makefile
new file mode 100644
index 000000000000..c1d3b141bb6b
--- /dev/null
+++ b/science/py-asdf-unit-schemas/Makefile
@@ -0,0 +1,31 @@
+PORTNAME=	asdf-unit-schemas
+PORTVERSION=	0.1.0
+CATEGORIES=	science python
+MASTER_SITES=	PYPI
+PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
+DISTNAME=	asdf_unit_schemas-${PORTVERSION}
+
+MAINTAINER=	sunpoet@FreeBSD.org
+COMMENT=	ASDF schemas for units
+WWW=		https://github.com/asdf-format/asdf-unit-schemas
+
+LICENSE=	BSD3CLAUSE
+LICENSE_FILE=	${WRKSRC}/LICENSE
+
+RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}asdf-standard>=1.0.1:science/py-asdf-standard@${PY_FLAVOR}
+
+USES=		python:3.8+
+USE_PYTHON=	autoplist concurrent distutils
+
+NO_ARCH=	yes
+
+.include <bsd.port.pre.mk>
+
+.if ${PYTHON_REL} < 30900
+RUN_DEPENDS+=	${PYTHON_PKGNAMEPREFIX}importlib-resources>=3:devel/py-importlib-resources@${PY_FLAVOR}
+.endif
+
+post-patch:
+	@${SED} -e 's|%%PORTVERSION%%|${PORTVERSION}|' ${FILESDIR}/setup.py > ${WRKSRC}/setup.py
+
+.include <bsd.port.post.mk>
diff --git a/science/py-asdf-unit-schemas/distinfo b/science/py-asdf-unit-schemas/distinfo
new file mode 100644
index 000000000000..a6791fc132bf
--- /dev/null
+++ b/science/py-asdf-unit-schemas/distinfo
@@ -0,0 +1,3 @@
+TIMESTAMP = 1674588062
+SHA256 (asdf_unit_schemas-0.1.0.tar.gz) = 42b78d67213efe4ffd4529fb0e58d9c7a0dab5cbf8839b230f1bc0a446bff999
+SIZE (asdf_unit_schemas-0.1.0.tar.gz) = 50607
diff --git a/science/py-asdf-unit-schemas/files/setup.py b/science/py-asdf-unit-schemas/files/setup.py
new file mode 100644
index 000000000000..6a6a4fa69815
--- /dev/null
+++ b/science/py-asdf-unit-schemas/files/setup.py
@@ -0,0 +1,48 @@
+#!/usr/bin/env python
+# setup.py generated by flit for tools that don't yet use PEP 517
+
+from distutils.core import setup
+
+packages = \
+['asdf_unit_schemas']
+
+package_data = \
+{'': ['*']}
+
+package_dir = \
+{'': 'src'}
+
+install_requires = \
+['asdf-standard >= 1.0.1']
+
+extras_require = \
+{':python_version<"3.9"': ['importlib_resources >= 3'],
+ 'docs': ['tomli',
+          'sphinx',
+          'sphinx-asdf >= 0.1.3',
+          'sphinx-astropy',
+          'astropy >= 5.0.4',
+          'graphviz',
+          'matplotlib',
+          'docutils',
+          'sphinx-rtd-theme'],
+ 'test': ['asdf >= 2.8.0', 'asdf-astropy', 'scipy', 'pytest']}
+
+entry_points = \
+{'asdf.resource_mappings': ['asdf_unit_schemas = '
+                            'asdf_unit_schemas.integration:get_resource_mappings']}
+
+setup(name='asdf_unit_schemas',
+      version='%%PORTVERSION%%',
+      description='ASDF schemas for units',
+      author=None,
+      author_email='The ASDF Developers <help@stsci.edu>',
+      url=None,
+      packages=packages,
+      package_data=package_data,
+      package_dir=package_dir,
+      install_requires=install_requires,
+      extras_require=extras_require,
+      entry_points=entry_points,
+      python_requires='>=3.8',
+     )
diff --git a/science/py-asdf-unit-schemas/pkg-descr b/science/py-asdf-unit-schemas/pkg-descr
new file mode 100644
index 000000000000..ea73cd3a77df
--- /dev/null
+++ b/science/py-asdf-unit-schemas/pkg-descr
@@ -0,0 +1,3 @@
+asdf-unit-schemas provides ASDF schemas for validating unit tags. Users should
+not need to install this directly; instead, install an implementation package
+such as asdf-astropy, which includes asdf-unit-schemas as a dependency.