Terrance Quinn (born July 15, 1952), known professionally as Terry O'Quinn, is an American actor. He is best known for his Emmy Award-winning performance as John Locke on the TV series Lost (2004–2010). He had roles in films including The Stepfather (1987), The Rocketeer (1991), Heaven's Gate (1980), Silver Bullet (1985), Young Guns (1988), Blind Fury (1989), Tombstone (1993) and Primal Fear (1996). Other prominent television roles include Peter Watts in Millennium (1996–1999), FBI Asst. Director Kendall in Alias (2002–2004), Commander Joe White in Hawaii Five-0 (2011–2018), and Tom Tavner in Patriot (2015–2018).

Filmography

• 2026Primetime — John Locke (archive footage) (uncredited)
• The Walking Dead: The Ones Who Live — Major General Johnathan Beale
• 2024Unsung Hero — Grandpa James
• LOST: Circle — John Locke
• PIECES OF HER — Martin Queller
• 2021Christmas Sail — Dennis
• Resident Alien — Peter Bach, Peter Bach (voice)
• Ultra City Smiths — Captain Krieger (voice)
• FBI: Most Wanted — Byron LaCroix
• Emergence — Richard Kindred
• Perpetual Grace LTD — Wesley Walker
• Castle Rock — Dale Lacy
• The Blacklist: Redemption — Howard Hargrave
• 2016New Life — Dr. Philip Sumrall
• Patriot — Tom Tavner
• Secrets and Lies — John Warner
• Gang Related — Sam Chapel
• Full Circle — Jimmy Parerra
• 666 Park Avenue — Gavin Doran
• Ring of Fire — Oliver Booth
• 2011Taken from Me: The Tiffany Rubin Story — Mark Miller
• Hawaii Five-0 — Joe White
• Masters of Science Fiction
• Lost — John Locke
• NCIS — Will Ryan
• 2003Old School — Goldberg (uncredited)
• 2003Phenomenon II
• First Monday
• 2002Hometown Legend — Buster Schuler
• 2002The Locket — Casey Keddington
• 2002Town Diary
• Alias — Kendall
• 2001American Outlaws — Rollin H. Parker
• Law & Order: Criminal Intent — Gordon Buchanan
• 2001Semper Fi — Cliff's Father
• 2001WW3 — Eric Farrell
• 2000Rated X — J.R. Mitchell
• Harsh Realm
• 1999Murder in a Small Town — Sidney Lassiter
• Roswell — Carl
• The West Wing — Nicholas Alexander
• 1998The X-Files — Michaud
• 1997Breast Men — Hersch Lawyer
• 1997My Stepson, My Lover — Richard Cory
• 1997On the Edge of Innocence — David Walker
• 1997Shadow Conspiracy — Frank Ridell
• 1996Ghosts of Mississippi — Judge Hilburn
• Millennium — Peter Watts
• 1996Primal Fear — Yancy
• JAG — Admiral Thomas Boone
• 1995Ray Alexander: A Menu for Murder — Frank Darnell
• 1995Shadow Warriors — Dr. Connors
• The Client — Bert Halliwell
• 1994A Friend to Die For — Ed Saxe
• 1994Don't Talk to Strangers — Bonner
• Earth 2 — Reilly
• 1994Heart of a Child — Gordon Holc
• 1994Justice in a Small Town — Harris Wiley
• 1994Lipstick Camera — Raymond Miller
• 1994MacShayne: Winner Takes All — Danny Leggett
• 1993Amityville: A New Generation — Detective Clark
• 1993Born Too Soon — Dr. Friedman
• Diagnosis: Murder — Ronald Trent
• Homicide: Life on the Street — Bailey Lafeld
• The X-Files — Lt. Brian Tillman, Shadow Man
• 1993Tombstone — Mayor Clum
• 1993Visions of Murder — Adm. Truman Hager
• 1992Deliver Them from Evil: The Taking of Alta View — Sergeant Don Bell
• 1992My Samurai
• 1992Sexual Advances — Cliff Ripley
• 1992The Cutting Edge — Jack Moseley
• 1992The Good Fight — Henry Cragin
• 1992Trial: The Price of Passion — Bob Altschuler
• 1992Wild Card — Barlow
• 1991Company Business — Colonel Pierce Grissom
• 1991Shoot First: A Cop's Vengeance — Sergeant Nicholas
• Son of the Morning Star — Gen. Alfred Terry
• 1991The Last to Go — Daniel
• 1991The Rocketeer — Howard Hughes
• 1990Blood Oath — Major Beckett
• 1990Kaleidoscope — Henry
• 1990Perry Mason: The Case of the Desperate Deception — Curt Mitchell
• 1989Blind Fury — Frank Devereaux
• 1989Guts and Glory: The Rise and Fall of Oliver North — Aaron Sykes
• 1989Roe vs. Wade — Jay Floyd
• 1989Stepfather 2 — Dr. Gene Clifford / Jerry Blake
• Tales from the Crypt — Inspector Martin Zeller
• 1989The Forgotten One — Bob Anderson
• 1988Pin — Dr. Frank Linden
• 1988Stranger on My Land — Connie Priest
• 1988The Jogger — Jerry
• 1988Young Guns — Alex McSween
• A Year in the Life — Keith
• At Mother's Request — Joel Campbell
• 1987Black Widow — Bruce
• Jake and the Fatman — Vincent Novak
• Star Trek: The Next Generation — Admiral Eric Pressman
• 1987The Stepfather — Jerry Blake
• 1987When the Time Comes — Wes Travis
• 1986Between Two Women — Dr. Wallace
• L.A. Law — Nick Moats
• Matlock
• 1986SpaceCamp — Launch Director
• 1986Women of Valor — Maj. Tom Patterson
• 1985An Early Frost — Dr. Redding
• 1985Mischief — Claude Harbrough
• Moonlighting — Bryant Wilbourne
• 1985Right to Kill? — Jim Barrett
• 1985Silver Bullet — Sheriff Joe Haller
• The Twilight Zone — Curt Lockridge (segment "Chameleon")
• Miami Vice — Richard Cain
• 1984Mrs. Soffel — Detective Buck McGovern
• 1984Places in the Heart — Buddy Kelsey
• 1983All the Right Moves — Freeman Smith
• 1983Jacobo Timerman: Prisoner Without a Name, Cell Without a Number — Colonel Thomas Rhodes
• 1983Without a Trace — Parent
• Remington Steele — Chuck McBride
• 1980F.D.R.: The Last Year — James Roosevelt
• 1980Heaven's Gate — Captain Minardi
• Tales of the Unexpected — Cop
• Hallmark Hall of Fame — Michael Keddington's Abusive Father

Appearances as themselves (5)

• 2024Getting LOST — Self
• Mysteries of the Missing — Self - Host
• Jimmy Kimmel Live! — Self
• Good Day Live — Self
• The View — Self