| God of War | 2018 | Sindri (voice, as Adam Harrington) | Unknown |
| Station 19 | 2018 | Lane Bishop | TV Show |
| The Rookie | 2018 | Dale | TV Show |
| Dirty John | 2018 | Matt Murphy | TV Show |
| The Detectives | 2018 | Detective Superintendant Ken Leppert | TV Show |
| Magnum Opus | 2017 | Daniel Cliff (as Adam Harrington) | Movie |
| Training Day | 2017 | Rick Quanstrom | TV Show |
| Daytime Divas | 2017 | Jason Abel | TV Show |
| S.W.A.T. | 2017 | Pronger | TV Show |
| Wisdom of the Crowd | 2017 | Chris Zymuski | TV Show |
| Shooter | 2016 | | TV Show |
| Shadowhunters | 2016 | Michael Wayland | TV Show |
| Notorious | 2016 | Brian Farringdon | TV Show |
| Battlefield: Hardline | 2015 | Tyson Latchford (voice, as Adam Harrington) | Unknown |
| The Heyday of the Insensitive Bastards | 2015 | Henry (as Adam Harrington) | Movie |
| City Bus | 2015 | Henry (as Adam Harrington) | Short Film |
| TURN: Washington's Spies | 2014 | Gamble / Lt. Gamble / Sutherland | TV Show |
| Bosch | 2014 | FBI Agent Brenner / FBI Agent Jack Brenner | TV Show |
| NCIS: New Orleans | 2014 | Jason Axelrod | TV Show |
| Fearless Fantasy | 2014 | King Xola (voice, as Adam John Harrington) | Unknown |
| The Wolf Among Us | 2013 | Bigby Wolf / The Woodsman | Unknown |
| Major Crimes | 2012 | Daniel Maguire | TV Show |
| Baby Daddy | 2012 | Mark Clements | TV Show |
| The Mob Doctor | 2012 | Agent Owen York | TV Show |
| Life of Lemon | 2011 | Rob (as Adam John Harrington) | Movie |
| Faces in the Crowd | 2011 | Bryce #8 (as Adam John Harrington) | Movie |
| Lucky | 2011 | Steve Mason | Movie |
| Luck | 2011 | Dennis Bowman | TV Show |
| L.A. Noire | 2011 | Roy Earle (as Adam John Harrington) | Unknown |
| The Secret Circle | 2011 | Ethan Conant | TV Show |
| Dinner with Fred | 2011 | Fred Conrad (as Adam John Harrington) | Short Film |
| Outlaw | 2010 | Dr. Jeffrey Engler | TV Show |
| The Ugly Truth | 2009 | Jack Magnum (as Adam John Harrington) | Movie |
| Castle | 2009 | Brad Melville | TV Show |
| Drop Dead Diva | 2009 | Attorney Carlyle | TV Show |
| Parks and Recreation | 2009 | Congressman Murray | TV Show |
| NCIS: Los Angeles | 2009 | Robert Bryant | TV Show |
| League of Legends | 2009 | | Unknown |
| Passchendaele | 2008 | Colonel Ormond (as Adam John Harrington) | Movie |
| Turbo Dates | 2008 | Spencer | TV Show |
| Surviving My Mother | 2007 | Michael (as Adam Harrington) | Movie |
| Cries in the Dark | 2006 | Scott (as Adam Harrington) | TV Movie |
| Flight 93 | 2006 | Dixie - F-16 Pilot (as Adam Harrington) | TV Movie |
| The Secret of Hidden Lake | 2006 | Sam (as Adam Harrington) | TV Movie |
| Dexter | 2006 | Agent Walker | TV Show |
| Whistler | 2006 | Ryan McKaye | TV Show |
| Criminal Minds | 2005 | Phillip Connor | TV Show |
| Reunion | 2005 | | TV Show |
| Supernatural | 2005 | Bartholomew | TV Show |
| Veil | 2005 | Robert (as Adam Harrington) | Short Film |
| Say Yes | 2005 | Roger (as Adam Harrington) | Short Film |
| Connie and Carla | 2004 | Cute Guy (as Adam Harrington) | Movie |
| Deep Evil | 2004 | Major Michael Ross (as Adam Harrington) | TV Movie |
| Perfect Romance | 2004 | Peter's Friend (as Adam Harrington) | TV Movie |
| A Very Cool Christmas | 2004 | Matt (as Adam Harrington) | TV Movie |
| CSI: NY | 2004 | Officer Noonan | TV Show |
| Show Me Yours | 2004 | Dr. Benjamin Chase | TV Show |
| Rugged Rich and the Ona Ona | 2004 | Brad (as Adam Harrington) | Short Film |
| House of the Dead | 2003 | Rogan (as Adam Herrington) | Movie |
| Out of Order | 2003 | Brock | TV Show |
| NCIS | 2003 | Coast Guard Commander Sam Hendrix | TV Show |
| Dead in a Heartbeat | 2002 | Coroner (as Adam Harrington) | TV Movie |
| CSI: Miami | 2002 | First Officer | TV Show |
| Jeremiah | 2002 | Team Leader | TV Show |
| The Dead Zone | 2002 | Bill Stade | TV Show |
| Good Morning | 2002 | Evangelist (as Adam Harrington) | Short Film |
| Out Cold | 2001 | Team Snownook Leader (as Adam Harrington) | Movie |
| Valentine | 2001 | Jason Marquette (as Adam Harrington) | Movie |
| A Girl Thing | 2001 | | TV Movie |
| Just Cause | 2001 | Kyle Summers | TV Show |
| Smallville | 2001 | Dr. Litvack | TV Show |
| The Chris Isaak Show | 2001 | Father Ken | TV Show |
| Oh, Baby | 2001 | Doug (as Adam Harrington) | TV Movie |
| Till Dad Do Us Part | 2001 | Brent Fenwick (as Adam Harrington) | TV Movie |
| Sanctimony | 2000 | Hank (as Adam Harrington) | Movie |
| Without Malice | 2000 | Mike Wilkes (as Adam Harrington) | TV Movie |
| Andromeda | 2000 | High Guard Captain Grissum | TV Show |
| CSI: Crime Scene Investigation | 2000 | Ronald Basderic | TV Show |
| Freedom | 2000 | Major Blaine Conrad | TV Show |
| Secret Agent Man | 2000 | Dr. Chelton | TV Show |
| The Wednesday Woman | 2000 | Everett Madison (as Adam Harrington) | TV Movie |
| Y2K | 1999 | Ken (as Adam Harrington) | Movie |
| Queer as Folk | 1999 | Connor James | TV Show |
| Da Vinci's Inquest | 1998 | Josh Warner / Phil Mizlowski | TV Show |
| First Wave | 1998 | Acolyte | TV Show |
| Mentors | 1998 | Sandy Mear | TV Show |
| Seven Days | 1998 | Tyler Langford / Darren Sebastian | TV Show |
| The Crow: Stairway to Heaven | 1998 | Brock Draven / Ghost Soldier | TV Show |
| Welcome to Paradox | 1998 | Davey | TV Show |
| Wounded | 1997 | Paramedic #2 (as Adam Harrington) | Movie |
| Breaker High | 1997 | Serge | TV Show |
| NightMan | 1997 | Burton | TV Show |
| Stargate SG-1 | 1997 | Khonsu / Goa'uld #2 | TV Show |
| Millennium | 1996 | Uniformed Cop | TV Show |
| The Principles of Karma | 1996 | Jim the Cable man (as Adam Harrington) | Short Film |
| The Outer Limits | 1995 | Ty Chafey / Billy Valentine / Puppet Show Host | TV Show |
| Viper | 1994 | New Driver #1 | TV Show |
| General Hospital | 1963 | John Jagger Cates | TV Show |
| The Stalking Fields | | Rawlings Sr. | Movie |
| The Coupon | | Phillip | Short Film |
