Ethan of Athos is a 1986 science fiction novel by American author Lois McMaster Bujold. The title character is Dr. Ethan Urquhart, Chief of Biology at the Sevarin District Reproduction Centre on the planet Athos, who is sent to find out what happened to a shipment of vital ovarian tissue cultures. Set in the fictional universe of Bujold's Vorkosigan Saga, the novel mentions but does not feature her usual protagonist Miles Vorkosigan. To date, Bujold has never revisited the settings of Athos or Kline Station in her many subsequent novels, but the events of "Ethan of Athos" are later referred to indirectly in the novels "Borders of Infinity" (1989) and "Cetaganda" (1995).