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Peter Gallagher Filmography
| 2025 | Everybody's Live with John Mulaney (TV Series) · as Future John Mulaney |
| 2024 | Humane · as Charles York |
| 2024 | WondLa (TV Series) · as Antiquus |
| 2022 | Firebuds (TV Series) · as Brian Whaleson |
| 2022 | Reboot (2022) (TV Series) · as Tyler |
| 2021 | Zoey's Extraordinary Christmas · as Mitch Clarke |
| 2021 | One December Night · as Mike |
| 2021 | Mr. Mayor (TV Series) · as Brett (uncredited) |
| 2020 | Palm Springs · as Howard |
| 2020 | The Owl House (TV Series) · as Del Clawthorne (voice) |
| 2020 | Zoey's Extraordinary Playlist (TV Series) · as Mitch Clarke |
| 2019 | Truth Be Told (2019) (TV Series) · as Andrew Finney |
| 2019 | After · as Ken Scott |
| 2019 | The Little Mermaid: An Immersive Live-to-Film Concert Experience · as King Triton |
| 2018 | The Conners (TV Series) · as Brian Foster |
| 2018 | Sideswiped (TV Series) · as Andrew |
| 2017 | Submission · as Len |
| 2017 | A Bad Moms Christmas · as Hank Mitchell |
| 2017 | The Gifted (TV Series) · as Benedict Ryan |
| 2017 | Literally, Right Before Aaron · as Orson Schwartzman |
| 2016 | Center Stage: On Pointe · as Jonathan Reeves |
| 2016 | Cruel Intentions · as Edward Valmont |
| 2015 | Hello, My Name Is Doris · as Willy Williams |
| 2015 | Grace and Frankie (TV Series) · as Nick Skolka |
| 2015 | Man Seeking Woman (TV Series) · as Joel Greenberg |
| 2015 | Togetherness (TV Series) · as Larry |
| 2013 | Kroll Show (TV Series) · as Sage |
| 2012 | Step Up: Revolution · as Mr. Anderson |
| 2011 | Someday This Pain Will Be Useful to You · as Paul Sveck |
| 2011 | Whitney (TV Series) · as Vince |
| 2011 | New Girl (TV Series) · as Gavin |
| 2010 | Burlesque · as Vince Scali |
| 2010 | Conviction · as Barry Scheck |
| 2010 | Covert Affairs (TV Series) · as Arthur Campbell |
| 2010 | GasHole · as Narrator (voice) |
| 2009 | The Good Wife (TV Series) · as Ethan Carver |
| 2009 | Adam · as Marty Buchwald |
| 2009 | The War Boys · as Slater |
| 2008 | Center Stage: Turn It Up · as Jonathan Reeves |
| 2007 | The Gathering (TV Series) · as Dr. Michael Foster |
| 2007 | Californication (TV Series) · as Dean Stacy Koons |
| 2006 | Shark (TV Series) |
| 2005 | How I Met Your Mother (TV Series) · as Professor Vinick |
| 2005 | Grey's Anatomy (TV Series) · as David Hamilton |
| 2005 | Robot Chicken (TV Series) · as Douglas Goldstein |
| 2004 | Rescue Me (TV Series) · as Father Phil |
| 2003 | A Tale of Two Wives · as Bill Goodman |
| 2003 | The O.C. (TV Series) · as Sandy Cohen |
| 2003 | How to Deal · as Len Martin |
| 2003 | Secrets of the Pyramids · as Narrator |
| 2002 | The Adventures of Tom Thumb & Thumbelina · as The Mole King (voice) |
| 2002 | Mr. Deeds · as Chuck Cedar |
| 2001 | The Feast of All Saints · as Philippe Ferronaire |
| 2001 | Protection · as Ted |
| 2001 | Perfume · as Guido |
| 2000 | The Last Debate · as Tom Chapman |
| 2000 | Jesus Christ Superstar · as First Priest |
| 2000 | Center Stage · as Jonathan Reeves |
| 2000 | Cupid & Cate · as Harry |
| 2000 | The 72nd Annual Academy Awards · as Buddy Kane |
| 2000 | Other Voices · as Jordin |
| 1999 | Brotherhood of Murder · as Bob Matthews |
| 1999 | House on Haunted Hill · as Donald W. Blackburn, M.d. |
| 1999 | American Beauty · as Buddy Kane |
| 1999 | Law & Order: Special Victims Unit (TV Series) · as William Dodds |
| 1999 | Family Guy (TV Series) · as Jared (voice) |
| 1998 | The Secret Lives of Men (TV Series) |
| 1998 | Johnny Skidmarks · as Johnny Scardino |
| 1998 | Brave New World · as Bernard Marx |
| 1998 | Host · as Dr. Joe Messenger |
| 1997 | The Man Who Knew Too Little · as James Ritchie |
| 1997 | Path to Paradise: The Untold Story of the World Trade Center Bombing · as John Anticev |
| 1997 | The Trial of Adolf Eichmann · as Gideon Hausner (voice) |
| 1996 | Titanic (TV Series) · as Wynn Park |
| 1996 | To Gillian on Her 37th Birthday · as David Lewis |
| 1996 | Superman: The Animated Series (TV Series) · as Kurt (voice) |
| 1996 | Last Dance · as John Hayes |
| 1995 | Cafe Society · as Jack Kale |
| 1995 | The Underneath · as Michael Chambers |
| 1995 | While You Were Sleeping · as Peter Callaghan |
| 1994 | Mrs. Parker and the Vicious Circle · as Alan Campbell |
| 1994 | White Mile · as Jack Robbins |
| 1994 | Mother's Boys · as Robert Madigan |
| 1994 | The Hudsucker Proxy · as Vic Tenetta |
| 1993 | Short Cuts · as Stormy Weathers |
| 1993 | |
| 1993 | Fallen Angels (TV Series) · as Dr. Yorgrau |
| 1993 | Watch It · as John |
| 1993 | Homicide: Life on the Street (TV Series) |
| 1992 | Bob Roberts · as Dan Riley |
| 1992 | The Player · as Larry Levy |
| 1991 | The Cabinet of Dr. Ramirez · as Matt |
| 1991 | Late for Dinner · as Bob Freeman |
| 1991 | An Inconvenient Woman (TV Series) · as Philip Quennell |
| 1990 | Milena · as Pollak |
| 1990 | Tune in Tomorrow... · as Richard Quince |
| 1990 | Love and Lies · as David West |
| 1989 | Sex, Lies, and Videotape · as John Mullany |
| 1988 | I'll Be Home for Christmas · as Aaron Copler |
| 1988 | High Spirits · as Brother Tony |
| 1988 | Murphy Brown (TV Series) · as John Haggerty |
| 1988 | American Experience (TV Series) · as Eastman |
| 1988 | The Caine Mutiny Court-Martial · as Lt. Cmdr. John Challee |
| 1988 | The Murder of Mary Phagan (TV Series) · as Leo Frank |
| 1987 | Private Eye (TV Series) · as Tommy Baron |
| 1987 | Long Day's Journey Into Night · as Edmund Tyrone |
| 1986 | My Little Girl · as Kai |
| 1986 | Screenplay (1986) (TV Series) · as Philip Kautsky |
| 1985 | Dreamchild · as Jack Dolan |
| 1984 | Terrible Joe Moran · as Nick |
| 1982 | Summer Lovers · as Michael Pappas |
| 1980 | American Playhouse (TV Series) · as Charles Castle |
| 1980 | The Idolmaker · as Caesare |
| 1980 | Skag (TV Series) |
| 1977 | ABC Weekend Special (TV Series) · as Phil Grey |
| 1952 | Guiding Light (TV Series) · as Chuck Haskell (1979) |
| 1951 | Hallmark Hall Of Fame (TV Series) · as Harry |
| 2022 | Bonnie · as Self |
| 2022 | The Day the Music Died/American Pie · as Self |
| 2021 | Broadway: Beyond the Golden Age · as Self |
| 2020 | One Night Only: The Best of Broadway · as Self |
| 2020 | Stars In The House (TV Series) · as Self |
| 2019 | The Kelly Clarkson Show (TV Series) · as Self - Guest |
| 2019 | Tamron Hall (TV Series) · as Self - Guest |
| 2015 | The 69th Annual Tony Awards · as Self - Performer |
| 2014 | The Meredith Vieira Show (TV Series) · as Self - Guest |
| 2013 | The Broadway.Com Show (TV Series) · as Self |
| 2010 | The Talk (TV Series) · as Self - Guest |
| 2010 | Access Hollyood Live (TV Series) · as Self |
| 2010 | Sundance Skippy · as Self |
| 2008 | The Wendy Williams Show (TV Series) · as Self - Guest |
| 2006 | The Megan Mullally Show (TV Series) · as Self - Guest |
| 2006 | 2006 Independent Spirit Awards · as Self - Performer |
| 2005 | Kathy Griffin: My Life on the D-List (TV Series) · as Self |
| 2005 | The Late Late Show with Craig Ferguson (TV Series) · as Self |
| 2005 | VH1 Big in 05 · as Self |
| 2004 | The O.C.: Obsess Completely · as Self |
| 2004 | The Tony Danza Show (TV Series) · as Self |
| 2004 | On Air With Ryan Seacrest (TV Series) · as Self - The O.c. |
| 2004 | The 30th Annual People's Choice Awards · as Self |
| 2004 | The Teen Choice Awards 2004 · as Self |
| 2003 | The Ellen DeGeneres Show (TV Series) · as Self |
| 2003 | Comedy Central Roast of Denis Leary · as Self |
| 2003 | Comedy Central Roasts (TV Series) · as Self |
| 2003 | The Teen Choice Awards 2003 · as Self |
| 2003 | Jimmy Kimmel Live! (TV Series) · as Self - Guest |
| 2002 | The Wayne Brady Show (TV Series) · as Self |
| 2002 | Contest Searchlight (TV Series) · as Self |
| 2002 | The 56th Annual Tony Awards · as Self - Performer |
| 2001 | Good Day Live (TV Series) · as Self |
| 2000 | American Beauty: Look Closer... · as Self |
| 2000 | The Making of 'Center Stage' · as Self |
| 1998 | Fox and Friends (USA) (TV Series) · as Self |
| 1997 | The View (TV Series) · as Self |
| 1997 | 3rd Annual Screen Actors Guild Awards · as Self - Presenter |
| 1996 | The West (TV Series) · as Self |
| 1996 | The Daily Show (TV Series) · as Self - Guest |
| 1996 | The Rosie O'Donnell Show (TV Series) · as Self - Guest |
| 1996 | Cannes Man · as Self |
| 1996 | The 50th Annual Tony Awards · as Self - Presenter |
| 1993 | Late Night with Conan O'Brien (TV Series) · as Self - Guest |
| 1993 | |
| 1992 | Late Show with David Letterman (TV Series) · as Self - Guest |
| 1992 | HBO First Look (TV Series) · as Self |
| 1992 | The 46th Annual Tony Awards · as Self - Performer |
| 1988 | LIVE with Kelly and Mark (TV Series) · as Self |
| 1987 | Biography (TV Series) · as Self |
| 1976 | Working in the Theatre (TV Series) · as Self |
| 1975 | Good Morning America (TV Series) · as Self - Guest |
| 1971 | Great Performances (TV Series) · as Self |
| 1956 | Tony Awards (TV Series) · as Self - Performer |
| 1952 | Today (TV Series) · as Self - Guest |
| 1991 | The Cabinet of Dr. Ramirez · as Story |