Gregory Harrison was born on May 31, 1950 in Avalon, Catalina Island, California, USA. He is an actor and producer, known for Trapper John, M.D. (1979), Picnic (1986) and Razorback (1984). He has been married to Randi Oakes since May 3, 1981. They have four children.
| 2025 | Signed, Sealed, Delivered: To The Moon And Back as Joe O'Toole |
| 2024 | Signed, Sealed, Delivered: A Tale of Three Letters as Joe O'Toole |
| 2022 | Jimmy and Carolyn |
| 2021 | The Nine Kittens of Christmas as Chief Sam |
| 2021 | Signed, Sealed, Delivered: The Vows We Have Made as Joe O’Toole |
| 2021 | Sweet Carolina as Pete |
| 2020 | Kaybolan as Dr. Bradley |
| 2019 | Love, Fall & Order as Hank Hart |
| 2018 | Signed, Sealed, Delivered: To the Altar as Joe O'Toole |
| 2017 | Signed, Sealed, Delivered: Home Again as Joe O'Toole |
| 2017 | Fair Haven as Doctor Gallagher |
| 2017 | Signed, Sealed, Delivered: Higher Ground as Joe O’Toole |
| 2016 | My Christmas Love as Tom Baker |
| 2016 | Signed, Sealed, Delivered: Lost Without You as Joe O’Toole |
| 2016 | Signed, Sealed, Delivered: One in a Million as Joe O'Toole |
| 2015 | Signed, Sealed, Delivered: Truth Be Told as Joe O'Toole |
| 2015 | Cloudy with a Chance of Love as Grant |
| 2014 | The Nine Lives of Christmas as Chief Sam |
| 2014 | The M Word |
| 2013 | After All These Years as David |
| 2012 | Undercover Bridesmaid as Mr. Thompson |
| 2010 | Accidental Icon: The Real Gidget Story |
| 2009 | Love n' Dancing as Carl |
| 2009 | Au Pair 3: Adventure in Paradise as Oliver Caldwell |
| 2009 | Hepsini Cehenneme Gönder as Whitmore |
| 2008 | Not Quite Hollywood as Self |
| 2003 | Hollywood's Magical Island: Catalina |
| 2001 | Au Pair II as Oliver Caldwell |
| 2000 | First Target as President Jonathan Hayes |
| 1999 | Au Pair as Oliver Caldwell |
| 1999 | First Daughter as President Jonathan Hayes |
| 1999 | Murder at 75 Birch as Rick Todson |
| 1998 | Air Bud: Golden Receiver as Dr. Patrick Sullivan |
| 1998 | Running Wild as Matt Robinson |
| 1997 | When Secrets Kill |
| 1996 | Summer of Fear as Mr. Marshall |
| 1996 | It's My Party as Brandon Theis |
| 1995 | Hard Evidence as Trent Turner |
| 1995 | Nothing Lasts Forever as Dr. Benjamin 'Ben' Wallace |
| 1995 | A Dangerous Affair as Robert Kenzer |
| 1994 | A Christmas Romance as Brian Harding |
| 1994 | Mortal Fear as Philip Montgomery |
| 1994 | Lies of the Heart: The Story of Laurie Kellogg as Bruce Kellogg |
| 1993 | Sudden Fury as Tom Kelley |
| 1993 | Caught in the Act as Scott McNally |
| 1993 | Cadillac Girls as Sam |
| 1992 | Body Chemistry II: Voice of a Stranger as Dan |
| 1992 | Duplicates as Bob Boxletter |
| 1992 | Breaking the Silence as Paul Danner |
| 1992 | Split Images as Robbie Daniels |
| 1991 | Bare Essentials as William 'Bill' Buzell owner of Luhana |
| 1990 | Angel of Death as Gary Nicholson |
| 1990 | Night of 100 Stars III as Self |
| 1990 | Dangerous Pursuit as John |
| 1988 | Red River as Cherry Valance |
| 1988 | Hot Paint as Willie |
| 1987 | Kuzey Sahili as Chandler |
| 1987 | Happy 100th Birthday, Hollywood as Self |
| 1986 | Picnic as Hal Carter |
| 1986 | Oceans of Fire as Ben Laforche |
| 1986 | The Nativity as Joseph (voice) |
| 1985 | Seduced as Mike Riordan |
| 1985 | Night of 100 Stars II as Self |
| 1984 | Razorback as Carl Winters |
| 1983 | The Hasty Heart as Sgt. Lachlen McLachlen |
| 1983 | The Fighter as Merle Banks |
| 1981 | For Ladies Only as John Phillips |
| 1980 | Enola Gay: The Men, the Mission, the Atomic Bomb as Capt. Bob Lewis |
| 1980 | The Women's Room as Ben Volper |
| 1980 | Kraft Salutes Disneyland's 25th Anniversary as Self |
| 1979 | The Best Place to Be as Rick Jawlosky |
| 1977 | The Gathering as Bud Jr. |
| 1977 | Fraternity Row as Zac |
| 1975 | Jim, the World's Greatest as Jim Nolan |
| 1975 | Trilogy of Terror as Arthur Moore |
| 1973 | The Harrad Experiment as Student (uncredited) |
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