Miles O'Brien
- Full Name: Miles Edward O'Brien
- Born: September 2328; Dublin, Ireland, Earth (DS9: "Whispers"; DS9 Novel: Mission Gamma: Lesser Evil)
- Species: Human
- Gender: Male
- Father: Michael O'Brien (TNG: "Disaster")
- At least two brothers (DS9 Novel: Mission Gamma: Lesser Evil)
- Wife: Keiko O'Brien (2367 - Present)
- Married May 23, 2367 (TNG: "Data's Day")
- Daughter: Molly O'Brien
- Son: Kirayoshi O'Brien
- By 2362: Petty officer, tactical specialist, Starfleet; USS Rutledge (DS9: "Tribunal")
- December 2363: Chief petty officer, relief alpha shift conn officer, Starfleet; USS Enterprise (NCC-1701-D) (TNG Novel: The Buried Age; TNG S1)
- Also occasionally served in security division as security guard
- By 2365: Chief petty officer, transporter chief, Starfleet; USS Enterprise (NCC-1701-D) (TNG Novel: The Buried Age; TNG)
- May 19, 2369: Senior chief petty officer, chief of operations, Starfleet; Deep Space 9 (DS9: "Emissary"; DS9)
- December 2375: Senior chief petty officer, instructor, Starfleet; Starfleet Academy (DS9: "What You Leave Behind", DS9 Novel: Mission Gamma: Lesser Evil)