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Glenn Franklin Howerton III (born April 13, 1976) is an American actor, screenwriter, producer and podcaster. He is best known for playing Dennis Reynolds on the long-running dark satirical comedy It's Always Sunny in Philadelphia (2005–present) on FX/FXX, a series he co-created with Charlie Day and Rob McElhenney, and on which he serves as an executive producer and writer. Since November 2021, he has co-hosted The Always Sunny Podcast, with his fellow co-creators McElhenney and Day.

His other notable performances include those as Jack Griffin, the lead role on NBC's A.P. Bio (2018–2021), Cliff Gilbert on Fox's The Mindy Project (2012–2017), Don Chumph on the first season of FX's Fargo (2014) and Corey Howard, the lead role on the short-lived spin-off comedy That '80s Show (2002). He also voices Fred Jones in the HBO Max series Velma (2023–present).

Early life and education
Glenn Franklin Howerton III was born on April 13, 1976 in Japan, the son of American parents Janice and Glenn Franklin Howerton Jr. His father was a fighter pilot. Almost immediately after his birth, his family moved to Arizona and then New Mexico for a short while. When he was three years old, they moved to the English town of Felixstowe, Suffolk. They subsequently moved to Virginia, followed by South Korea, where they settled in Seoul. When he was 10 years old, the family moved to Montgomery, Alabama.

After graduating from Jefferson Davis High School, he moved to Miami where he spent two years at New World School of the Arts of Miami Dade College. In 1996, he entered Juilliard School's Drama Division in New York City where he graduated with a Bachelor of Fine Arts as part of Group 29 (1996–2000).