| Year | Title | Role | Notes |
| 2000 | All That | Himself | Episode: "The cast from Snow Day/Hoku" |
| 2000 | Double Dare 2000 | Himself | Episode: "Snow Day vs. The Amanda Show" |
| 2000–2002 | The Amanda Show | Various characters | Series regular |
| 2001 | ER | Nick Stevens | Episode: "Thy Will Be Done" |
| 2001 | Family Guy | Charlie | Voice role (uncredited); Episode: "The Kiss Seen Around the World" |
| 2001 | Samurai Jack | S Kid / Pig No. 3 / Alien Kid | Voice; Episode: "Aku's Fairy Tales" |
| 2002 | Whatever Happened to Robot Jones? | Lenny | Voice role (5 episodes) |
| 2002 | MADtv | Jeffrey Lugz | 1 episode |
| 2002 | Fillmore! | Randall Julian | Voice role; episode: "To Mar a Stall" |
| 2003–2004 | The Guardian | Chris Rapp | 2 episodes |
| 2004–2007 | Drake & Josh | Josh Nichols | Co-lead role |
| 2005 | All That | Himself | Episode: "Nickelodeon's All That 10th Anniversary Reunion Special" |
| 2006 | Codename: Kids Next Door | Numbuh 50 Million B.C. | Voice role; Episode: "Operation: C.A.K.E.D.-F.I.V.E." |
| 2006 | What's New, Scooby-Doo? | Damian / Kid / Zombie Kid No. 2 | Voice roles, episode: "E-Scream" |
| 2006 | Drake & Josh Go Hollywood | Josh Nichols | Nickelodeon television film |
| 2008 | Merry Christmas, Drake & Josh | Nickelodeon Christmas special film |
| 2009 | iCarly | Jimmy | Uncredited; episode: "iReunite with Missy" |
| 2011 | Victorious | Audience Member, Josh Nichols | Episode: "Wok Star" Uncredited: "Who Did It to Trina" (via Archive Footage of "I Love Sushi" in Drake and Josh) |
| 2011 | Ice Age: A Mammoth Christmas | Eddie | TV special; voice role |
| 2013–2017 | Teenage Mutant Ninja Turtles | Casey Jones | Voice |
| 2013–2014 | The Mindy Project | Ray Ron | 3 episodes |
| 2014 | The Big Bang Theory | Jesse | Episode: "The Occupation Recalibration" |
| 2014 | The Rebels | Danny Norwood | Episode: "Pilot" |
| 2015–2016 | Grandfathered | Gerald | Main role |
| 2015 | Teen Choice Awards | Himself | Host |
| 2016 | Pitch | Ross | 2 episodes |
| 2016 | Ice Age: The Great Egg-Scapade | Eddie | TV special; voice role |
| 2016 | Lip Sync Battle | Himself | Episode: "Josh Peck vs. Christina Milian" |
| 2018–2020 | Fuller House | Ben | 2 episodes |
| 2018 | Best.Worst.Weekend.Ever. | Himself | Cameo |
| 2021 | Turner & Hooch | Scott Turner | Main role |
| 2021 | Robot Chicken | Josh Nichols | Voice role; episode: "May Cause Immaculate Conception" |
| 2022–2023 | How I Met Your Father | Drew | 13 episodes |
| 2022–2023 | iCarly | Paul | 5 episodes |
| 2025 | The Last of Us | Janowicz | Episode: "Day One" |
