Board Thread:Warhammer 40k General Discussion/@comment-8346920-20140206013644/@comment-173.79.220.193-20171105025534

There's a planet called Xenonia which had some regiments participate in Armegeddon that's implied to be all-female (it's not stated but the artwork was a woman and the planet's name is friggin' Xenonia for crying out loud)

That's the only official canon all-female regiment to my knowledge.