| Year | Title | Role | Notes |
| 2001 | Untitled Sisqo Project | Michael Golden | Unsold TV pilot |
| 2002 | Big Shot: Confessions of a Campus Bookie | Adam | Television film |
| 2002–2006 | Less than Perfect | Kipp Steadman | Main role, 81 episodes |
| 2003 | See Jane Date | Grant Asher | Television film |
| 2004 | The Division | Todd | 2 episodes |
| Curb Your Enthusiasm | Bellman | Episode: "Opening Night" |
| 2005 | Brody & Friends | Zac | Episode: "The Hollywood Lifestyle" |
| 2006 | Worst Week of My Life | Nick | Unsold pilot |
| 2007 | Imperfect Union | Clark | Television film |
| 2007–2012 | Chuck | Chuck Bartowski | Lead role, 91 episodes; also director of 3 episodes |
| 2011 | Team Unicorn | Young Lover | Episode: "Alien Beach Crashers" |
| 2011 Spike Video Game Awards | Host | Also consulting producer |
| Vietnam in HD | Karl Marlantes | Voice role, 6 episodes |
| 2012 | 4 Points | Himself | Episode: "Zachary Levi" |
| 2012–2022 | Robot Chicken | Various characters / Shazam | Voice role, 4 episodes |
| 2013 | Remember Sunday | Gus | Television film |
| 2014–2015 | Hollywood Game Night | Himself | 2 episodes |
| 2015 | Deadbeat | Abraham Lincoln | Episode: "The Emancipation Apparition" |
| Heroes Reborn | Luke Collins | Main role, 13 episodes |
| Geeks Who Drink | Himself | Host, also executive producer |
| 2015–2016 | Telenovela | James McMahon | Recurring role, 5 episodes |
| 2016 | The $100,000 Pyramid | Himself | Episode: "Zachary Levi vs. Teri Polo" |
| 2017 | Tangled: Before Ever After | Eugene "Flynn Rider" Fitzherbert | Television film, voice role |
| Alias Grace | Jeremiah Pontelli | Miniseries |
| Psych: The Movie | Billy McGoldrick | Television film |
| 2017–2020 | Rapunzel's Tangled Adventure | Eugene "Flynn Rider" Fitzherbert / Prince Horace | Main voice role, 56 episodes |
| 2018–2019 | The Marvelous Mrs. Maisel | Dr. Benjamin Ettenberg | Recurring role, 8 episodes |
| 2022 | Who Do You Think You Are? | Himself | Guest |
| Family Guy | Seymour | Voice role, episode: "Hard Boiled Meg" |
| 2023 | The Masked Singer | Himself | Guest, episode: "DC Superheroes Night" |
