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Titus B. Welliver (born March 12, 1962) is an American actor. He is best known for his portrayals of the Man in Black in Lost, Silas Adams in Deadwood, Jimmy O'Phelan in Sons of Anarchy, and the title role in the television series Bosch and Bosch: Legacy. He is also known for his collaborations with Ben Affleck, starring in his films Gone Baby Gone (2007), The Town (2010), Argo (2012), and Live by Night (2016).
| Year | Production | Role | Notes |
| 1990 | Navy SEALs | Redneck in Bar | |
| The Lost Capone | Ralph Capone | ||
| 1991 | The Doors | Macing Cop | |
| Mobsters | Al Capone | ||
| 1992 | An American Story | Jack Austin | |
| 1994 | Tick, Tick, Tick | Unknown | Short |
| Zero Tolerance | Ray Manta | ||
| Blind Justice | Sumner | ||
| 1995 | Born to Be Wild | Sergeant Markle | |
| 1996 | Mulholland Falls | Kenny Kamins, Mobster | |
| 1997 | The Clearing | Unknown | Short |
| The Big Fall | Moe | ||
| 2000 | Cement | Mo | |
| Once in the Life | Torch | ||
| 2003 | Biker Boyz | Max | |
| 2004 | Twisted | Dale Becker | |
| 2005 | Assault on Precinct 13 | Milos | |
| 2007 | Gone Baby Gone | Lionel McCready | |
| 2008 | The Narrows | Tony | |
| The Human Contract | Mr. Praylis | ||
| 2009 | Other People's Parties | Pat “The Patriot” Prescott | |
| Handsome Harry | Gebhardt | ||
| 2010 | Mafia II | Civilians | Video game voice role |
| The Town | Detective Dino Ciampa | ||
| 2012 | Man on a Ledge | Captain Dante Marcus | |
| Item 47 | Agent Felix Blake | Short Marvel Comics film, precursor to Marvel's Agents of S.H.I.E.L.D. TV series. | |
| Argo | Jon Bates | ||
| Promised Land | Rob | ||
| 2013 | Red 2 | Senior Director of Military Intelligence | Uncredited |
| 2014 | Transformers: Age of Extinction | James Savoy | |
| Poker Night | Maxwell | ||
| 2016 | Live by Night | Tim Hickey | |
| 2018 | Escape Plan 2: Hades | Gregor Faust | |
| 2019 | An Affair to Die For | Russell | |
| Shaft | Special Agent Vietti | ||
| 2021 | Batman: The Long Halloween | Carmine Falcone | Voice, direct-to-video |
| 2024 | Watchmen | Rorschach / Walter Kovacs | |
| 2025 | Ricky | Leslie Torino | |
| Killing Castro | Post-production | ||
| 2025 | Abraham's Boys | Abraham Van Helsing |
| Year | Production | Role | Notes |
| 1990 | Matlock | Johnny Bauer | Episode: "The Narc" |
| 1992 | Law | William Boyd | Episode: "Steal It Again, Sam" |
| Beverly Hills, 90210 | Doug | Episode: "Cardio-Funk" | |
| The Commish | Michael Harris | Episode: "Video Vigilante" | |
| 1993 | Tales from the Crypt | Salucci | Episode: "Forever Ambergris" |
| 1994 | The X-Files | Doug Spinney | Episode: "Darkness Falls" |
| One Woman's Courage | Television movie | ||
| 1995 | New York Undercover | Frankie | Episode: "Innocent Bystanders" |
| 1995–1998 | NYPD Blue | Dr. Mondzac | Recurring role; 8 episodes |
| 1996 | Kindred: The Embraced | Cameron | Episode: "Cabin in the Woods" |
| High Incident | Sergeant Crispo | 2 episodes | |
| Murder One | Larry White | 3 episodes | |
| 1997 | Nash Bridges | Richard Drake | Episode: "The Web" |
| The Practice | Gordon | Episode: "Hide and Seek" | |
| Rough Riders | Goodrich | Miniseries | |
| 1997–1998 | Brooklyn South | Officer Jake Lowery | Main role; 22 episodes |
| 1998 | The Day Lincoln Was Shot | Lewis Thornton Powell | Television movie |
| Spy Game | Sebastian Dane | Episode: "Necessity Is the Mother of Infection" | |
| 1999 | Total Recall 2070 | Henry Sumers | Episode: "Personal Effects" |
| Star Trek: Voyager | Lieutenant Maxwell Burke | Episode: Equinox Part 1 & 2 | |
| Touched by an Angel | Gregory / Lonnie | Episode: "The Occupant" | |
| Mind Prey | John Mail | Television movie | |
| 2000 | Falcone | Santino 'Sonny' Napoli | Episode: "Windows" |
| 2001 | Big Apple | FBI Special Agent Jimmy Flynn | 8 episodes |
| Blonde | The Baseball Player | Television miniseries | |
| UC: Undercover | Rick Jansen | Episode: "Kiss Tomorrow Goodbye" | |
| 2001–2002 | That's Life | Dr. Eric Hackett | Recurring role; 17 episodes |
| 2002 | Third Watch | Cameron | Episode: "Ladies' Day" |
| Law & Order: Special Victims Unit | Tom Landricks | Episode: "Resilience" | |
| 2003 | The Twilight Zone | Dylan | Episode: "The Monsters Are on Maple Street" |
| Hack | Zachary | 2 episodes | |
| 2004–2006 | Deadwood | Silas Adams | 26 episodes |
| 2006 | Law & Order | Bill Whitney | Episode: "Profiteer" |
| 2007 | Numb3rs | Agent Graves | Episode: "Finders Keepers" |
| Kidnapped | Senator Bill Ross | 2 episodes | |
| Jericho | Colonel Robert Hoffman | Episode: "Why We Fight" | |
| NCIS | Navy Captain Roger Walsh | Episode: "Leap of Faith" | |
| Shark | Dexter Modene / Javier | Episode: "In Absentia" | |
| 2007–2008 | Life | Kyle Hollis | 2 episodes |
| 2008 | Prison Break | Representative Scott | 2 episodes |
| 2009 | Monk | Daniel Reese | Episode: "Mr. Monk's Other Brother" |
| Raising the Bar | Nate Chrisman | Episode: "No Child's Left Behind" | |
| Kings | Bartender | Episode: "Chapter One" | |
| Supernatural | Roger / War | Episode: "Good God, Y'All" | |
| 2009–2010 | Lost | Man In Black | 3 episodes |
| 2010 | The Closer | Gregory Drisken | Episode: "Help Wanted" |
| 2009–2010 | Sons of Anarchy | Jimmy O'Phelan | 13 episodes |
| 2010 | True Blue | John Leeson | Television movie |
| Lost: The Final Journey | Himself / narrator | Television documentary |