Once & Future by AR Capetta and Cory McCarthy (Bks)

Blackheart Knights by Laure Eve

Legendborn by Tracy Deonn (Bks)*

The Other Merlin by Robyn Schneider (Bks)

Spear by Nicola Griffith

Bonus: For an Arthuriana anthology with queer rep, check out the upcoming Sword Stone Table ed. by Swapna Krishna and Jenn Northington (Bks), coming July 13, 2021

Bks = Bookshop affiliate links

*MC is not queer AFAIK but a love interest and many in the cast are