Glenn Howerton (gebore 13 April 1976) is 'n Amerikaanse akteur, skrywer, en vervaardiger. Hy is bekend vir sy rolle in die rolprente Serenity (2005), Crank (2006), en The Strangers (2008), en in die televisiereeks It's Always Sunny in Philadelphia (2005). 2005: Serenity 2006: Crank 2008: The Strangers 2010: It's Always Sunny in Philadelphia: Cast & Creators Live at the Paley Center 2013: Coffee Town 2002: That '80s Show 2005: It's Always Sunny in Philadelphia 2011: Vietnam in HD 2011: Dennis & Dee's Podcast 2018: A.P. Bio 2003: E.D.N.Y. 2004: It's Always Sunny on TV 2009: Boldly Going Nowhere 2007: It's Always Sunny in Philadelphia: Making of Season 1 & 2 2007: Two Weeks: Learning to Live through Dying 2008: It's Always Sunny in Philadelphia Season 3: Dancing Guy 2008: It's Always Sunny in Philadelphia Season 3: Meet the McPoyles 2008: It's Always Sunny in Philadelphia Season 3: Sunny Side Up 2008: It's Always Sunny in Philadelphia: Sunny Side Up 2009: The Nightman Cometh Live!