Ethan of Athos is a science fiction novel by Lois McMaster Bujold, set in the Vorkosigan Saga universe. It follows Ethan Urquhart, a man from the all-male planet of Athos, who embarks on a journey to find a way to reproduce without the involvement of women, leading to unexpected adventures and discoveries.

Ethan Urquhart, a physician from the planet Athos, is tasked with obtaining ovaries from a distant planet to help his society reproduce. His journey takes him to the planet Barrayar, where he encounters political intrigue, unexpected allies, and the complexities of gender and relationships.