Charles Peckham Day (born February 9, 1976) is an American actor, writer, and producer. He is best known for playing Charlie Kelly on the FX/FXX dark comedy It's Always Sunny in Philadelphia (2005–present), of which he is also a writer and an executive producer. In 2011, he was nominated for a Critics' Choice Television Award and a Satellite Award for the role. Subsequently, he co-created the Apple TV+ comedy Mythic Quest (2020–2025) with Rob Mac and Megan Ganz. In film, Day is best known for his performances as Dr. Newton Geiszler in Guillermo del Toro's Pacific Rim (2013), Dale Arbus in the comedy Horrible Bosses (2011) and its sequel Horrible Bosses 2 (2014), and Andy Campbell in the comedy Fist Fight (2017). He is also known for his voice roles in Monsters University (2013), The Lego Movie film franchise (2014–2019) and Nintendo franchise character Luigi in The Super Mario Bros. Movie (2023) and its sequel, The Super Mario Galaxy Movie (2026). He made his directorial debut with Fool's Paradise (2023). Description above from the Wikipedia article Charlie Day, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Filmography

• 2026Kill Me — Jimmy, Producer
• 2026The Super Mario Galaxy Movie — Luigi (voice)
• 2026Wildwood — Dmitri (voice)
• 2025Honey Don't! — Marty Metakawitch
• Side Quest — Executive Producer, Original Series Creator
• 2025Summer of 69 — Rick Richards
• Bupkis — Glen Rossi
• 2023Fool's Paradise — Latte Pronto, Director, Writer
• 2023For the Safety of Theo — Executive Producer
• 2023The Saint of Second Chances — Mike Veeck
• 2023The Super Mario Bros. Movie — Luigi (voice)
• 2022I Want You Back — Peter, Executive Producer
• Abbott Elementary — Charlie
• 2021How It Ends — Lonny
• Mythic Quest — Spencer, Executive Producer, Writer, Creator
• 2019The Lego Movie 2: The Second Part — Benny (voice)
• 2018Emmet's Holiday Party: A LEGO Movie Short — Benny (voice)
• 2018Hotel Artemis — Acapulco
• 2018Pacific Rim: Uprising — Dr. Newton Geiszler
• The Cool Kids — Chet the Handyman, Executive Producer, Writer, Creator
• 2017Fist Fight — Andy Campbell, Executive Producer
• 2017I Love You, Daddy — Ralph Kinder
• 2016The Hollars — Jason
• 2015Vacation — Chad
• 2014Horrible Bosses 2 — Dale Arbus
• It's Always Sunny in Moscow — Writer
• 2014Party Central — Art (voice)
• 2014The Emmet Awards Show! — Benny (voice / uncredited / archive footage)
• 2014The Lego Movie — Benny (voice)
• 2013Monsters University — Art (voice)
• 2013Pacific Rim — Dr. Newton Geiszler
• Rick and Morty — Salva-tron (voice)
• Unsupervised — Jesse Judge (Voice), Producer
• 2011Horrible Bosses — Dale Arbus
• 2010Going the Distance — Dan Grant
• 2009A Very Sunny Christmas — Charlie Kelly, Executive Producer, Writer
• 2009The Nightman Cometh: Live — Charlie Kelly, Writer
• 2008A Quiet Little Marriage — Adam
• Boldly Going Nowhere — Writer, Producer
• American Dad! — Jon (Voice)
• It's Always Sunny in Philadelphia — Charlie Kelly, Writer, Executive Producer
• 2003Love Thy Neighbor — Video Clerk
• Luis — Richie
• Reno 911! — Inbred Twin
• 2001Campfire Stories — Joe
• 2001Late Summer — Trevor
• Madigan Men
• 2000Mary and Rhoda — Mailroom Kid
• Third Watch — Michael Boscorelli
• Law & Order — Jeremy
• Boldly Going Nowhere — Trainee, Executive Producer

Appearances as themselves (14)

• 2025PaleyLive: It’s Always Sunny in Philadelphia 20th Anniversary Celebration! — Self
• Hot Ones Versus — Self
• Welcome to Wrexham — Self
• Snacked — Self
• The Kelly Clarkson Show — Self - Guest
• Hot Ones — Self
• The Late Show with Stephen Colbert — Self
• The Tonight Show Starring Jimmy Fallon — Self, Self - Guest
• Conan — Self
• Free Radio — Self
• Jimmy Kimmel Live! — Self, Self - Guest
• The View — Self - Guest
• Raw — Self
• Saturday Night Live — Self - Cameo (uncredited), Self - Host