Kieran Duffy
- Full Name: Kieran Duffy
- Born: Earth (SCE Short Story: "Interphase Book 2")
- Species: Human
- Gender: Male
- Cadet, Starfleet Academy
- Senior year: Captain, 3D polo team (SCE Short Story: "Here There Be Monsters")
- By 2366: Lieutenant junior grade, engineering officer, Starfleet; USS Enterprise (TNG: "Hollow Pursuits")
- By 2375: Lieutenant commander, second officer, Starfleet; USS da Vinci (SCE)