Stefan DeSeve
- Name: Stefan DeSeve
- Born: c.2330
- Species: Human
- Gender: Male
- By c.2350: Ensign, engineer, Starfleet (TNG: "Face of the Enemy")
- c.2350: Defection to Romulan Star Empire (TNG: "Face of the Enemy")
- Subcenturion, engineer, Romulan Guard (TNG: "Face of the Enemy")
- c.2360s: Involvement with Ambassador Spock, Romulan unification movement (TNG: "Face of the Enemy"; TNG Short Story: "Turncoats")
- July 9, 2369: Repatriation to Federation (TNG: "Face of the Enemy")
- Returned to Federation on request of Ambassador Spock, so as to facilitate defection of Vice-proconsul M'ret and aides (TNG: "Face of the Enemy"; TNG Short Story: "Turncoats")
- Arrested on charges of treason, held on USS Enterprise (NCC-1701-D) pending court martial (TNG: "Face of the Enemy")
- Death: July 12, 2369; USS Enterprise (NCC-1701-D) (TNG Short Story: "Turncoats")
- Killed in defending ship against Romulan sabotage attempt following recovery of Vice-proconsul M'ret (TNG Short Story: "Turncoats")
- On advice of Captain Jean-Luc Picard, charges of treason dismissed posthumously (TNG Short Story: "Turncoats")