Dennis Letts (September 5, 1934 – February 22, 2008) was an American college professor, and later, in a second career, an actor. As the latter, he originated the critically successful role of Beverly Weston in the Steppenwolf Theatre Company production of the Tony-winning play August: Osage County in the summer of 2007, the writing of which had earned his son, Tracy Letts, a Pulitzer prize.