| Year Title Role Notes | |
| 2000 Madigan Men Clerk "Episode: ""Three Guys, a Girl and a Conversation Nook""" | |
| 2001 Law & Order Jeremy "Episode: ""Swept Away – A Very Special Episode""" | |
| 2001–2004 Third Watch Michael Boscorelli 5 episodes | |
| 2003 Luis Richie 10 episodes | |
| 2004 Reno 911! Inbred Twin "Episode: ""Not Without My Mustache""" | |
| 2005–present It's Always Sunny in Philadelphia Charlie Kelly 144 episodes, also executive producer and writer | |
| 2011 Saturday Night Live Himself (host) "Episode: ""Charlie Day/Maroon 5""" | |
| 2012 Unsupervised Jesse Judge "Voice Episode: ""Jesse Judge Lawncare Incorporated""" | |
| 2012 Saturday Night Live Congressman Fenton Worthington Carrey "Episode: ""Jamie Foxx/Ne-Yo""" | |
| 2012 American Dad! Meth Head "Voice Episode: ""Adventures in Hayleysitting""" | |
| 2014 Drunk History Allan Pinkerton "Episode: ""Baltimore""" | |
| 2018 The Cool Kids Chet 1 episode, also co-creator, executive producer and writer | |
| TBA Mythic Quest - Producer and screenwriter | |