| Year | Title | Role | Notes |
| 1992–1993 | Unsolved Mysteries | Su-Ya's Brother-In-Law | 2 episodes |
| 1994 | Law & Order | Harry Watanabe | Episode: "Golden Years" |
| All-American Girl | Stan | Episode: "Ratting on Ruthie" |
| 1995 | All My Children | Dr. Kim | Episode |
| 1997 | Pacific Palisades | Kate's Attorney | Episode: "Sweet Revenge" |
| Night Man | Roland Yates | Episode: "Pilot: Part 1" |
| Beverly Hills, 90210 | Dr. Sturla | Recurring cast: season 8 |
| NYPD Blue | Simon Lee | Episode: "It Takes a Village" |
| 1998 | The Pretender | Lenny Duc | Episode: "Collateral Damage" |
| Seinfeld | Student No. 1 | Episode: "The Burning" |
| Brave New World | Ingram | Television film |
| The Practice | Testifying Officer | Episode: "Axe Murderer" |
| Ally McBeal | Police Officer | Episode: "The Inmates" |
| Fantasy Island | Chip Weston | Episode: "Dreams" |
| 1999 | Crusade | Lt. John Matheson | Main cast |
| Walker, Texas Ranger | Kahn | Episode: "The Lynn Sisters" |
| 2000 | Star Trek: Voyager | Astronaut – Gotana-Retz | Episode: "Blink of an Eye" |
| Murder, She Wrote: A Story to Die For | Everett Jang | Television film |
| 2001 | Once and Again | Co-Worker | Episode: "Won't Someone Please Help George Bailey Tonight" |
| Charmed | Yen Lo | Episode: "Enter the Demon" |
| CSI: Crime Scene Investigation | Special Agent Beckman | Episode: "Ellie" |
| 2001–2003 | Angel | Gavin Park | Guest: season 2, recurring cast: season 3-4 |
| 2002 | Any Day Now | Mr. Chung | Episode: "Call Him Macaroni" |
| 2003 | Street Time | Vo Nguyen | Episode: "Born to Kill" |
| Miss Match | Clifford Kim | Recurring cast |
| Momentum | Agent Frears | Television film |
| 2003–2004 | Star Trek: Enterprise | Corporal Chang | Recurring cast: season 3 |
| ER | Ken Sung | Recurring cast: season 10 |
| 24 | Tom Baker | Recurring cast: season 2-3 |
| 2004 | Without a Trace | Mark Hiroshi | Episode: "Exposure" |
| The Shield | Thomas Choi | Episode: "Riceburner" |
| 2004–2010 | Lost | Jin-Soo Kwon | Main cast |
| 2006 | Avatar: The Last Airbender | General Fong (voice) | Episode: "The Avatar State" |
| Justice League Unlimited | Metron (voice) | 2 episodes |
| 2007 | AZN Asian Excellence Awards | Himself/Host | Main host |
| 2007–2008 | Lost: Missing Pieces | Jin-Soo Kwon | Recurring cast |
| 2008 | The Andromeda Strain | Dr. Tsi Chou | Main cast |
| 2009 | Ace of Cakes | Himself | Episode: "Lost in Hawaii" |
| 2010–2017 | Hawaii Five-0 | Chin Ho Kelly | Main cast: season 1-7 |
| 2011 | CBS Cares | Himself | Episode: "2011" |
| G . Joe: Renegades | Teddy Lee (voice) | Episode: "The Anomaly" |
| 2012 | Iron Chef America | Himself | Episode: "Military Grill Battle: Big Eye Tuna" |
| NCIS: Los Angeles | Chin Ho Kelly | Episode: "Touch of Death" |
| 2012–2014 | The Legend of Korra | Hiroshi Sato (voice) | Recurring cast: season 1 & 4 |
| 2013 | Hollywood Game Night | Himself/Panelist | Episode: "The One With the Friends" |
| 2015 | Once Upon a Time | Fast Food Worker (voice) | Episode: "Darkness on the Edge of Town" |
| 2017 | Big Pacific | Himself/Narrator | Recurring narrator |
| MacGyver | Chin Ho Kelly | Episode: "Flashlight" |
| 2019 | Drop the Mic | Himself | Episode |
