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 dark comedy It's Always Sunny in Philadelphia (2005–present), which he stars with Rob McElhenney, Kaitlin Olson, Glenn Howerton and Danny DeVito, and 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. He subsequently co-created the Fox sitcom The Cool Kids (2018–2019) with Paul Fruchbom and the Apple TV+ comedy Mythic Quest (2020–present) with McElhenney and Megan Ganz. He continues to executive-produce the latter.
In film, Day is best known for his performances as biologist Dr Newton Geiszler in Guillermo del Toro's science-fiction monster movie Pacific Rim(2013) and its sequel Pacific Rim Uprising (2018), Dale Arbus in the comedy Horrible Bosses (2011) and sequel Horrible Bosses 2 (2014), and teacher 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 the Nintendo franchise character Luigi in The Super Mario Bros. Movie (2023). He made his directorial debut with Fool's Paradise in 2023.
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2025
2023
as Mike Veeck
2023
as Latte Pronto
2023
as Glen Rossi
2023
as Luigi (voice)
2022
as Self
2022
as Peter
2021
as Charlie
2021
as Lonny
2020
as Spencer
2019
as Benny (voice)
2018
as Benny (voice)
2018
as Chet the Handyman
2018
as Acapulco
2018
as Dr. Newton Geiszler
2018
as Self
2017
as Ralph Kinder
2017
as Andy Campbell
2016
as Jason
2015
as Chad
2014
as Dale Arbus
2014
as Benny (voice / uncredited / archive footage)
2014
as Art (voice)
2014
as Benny (voice)
2013
as Dr. Newton Geiszler
2013
as Art (voice)
2012
as Jesse Judge (Voice)
2011
as Dale Arbus
2010
as Dan Grant
2009
as Charlie Kelly
2009
as Charlie Kelly
2008
as Adam
2005
as Charlie Kelly
2005
as Video Clerk
2005
as Jon (Voice)
2003
as Richie
2003
as Inbred Twin
2001
as Trevor
2001
as Joe
2001
as Mr. Nudger
2000
2000
as Mailroom Kid
1999
as Michael Boscorelli
1993
1990
as Jeremy
as Jimmy
as (voice)