Kasi Lemmons (/ˈkeɪsi/; born Karen Diane Lemmons, February 24, 1959) is an American film director, screenwriter, and actress. She made her directorial debut with Eve's Bayou (1997), followed by The Caveman's Valentine (2001), Talk to Me (2007), Black Nativity (2013), Harriet (2019), and Whitney Houston: I Wanna Dance with Somebody (2022). She also directed the Netflix limited series Self Made (2020) and an episode of ABC's Women of the Movement (2022).

She is also known as an actress, having started her career with roles in commercials with McDonald's and Levi's. She made her film debut in Spike Lee's School Daze (1988). She continued acting in Vampire's Kiss (1989), The Silence of the Lambs (1991), and Candyman (1992). Film scholar Wheeler Winston Dixon described her as "an ongoing testament to the creative possibilities of film".