Jean Elizabeth Smart (born September 13, 1951) is an American actress. After beginning her career in regional theater in the Pacific Northwest, she appeared on Broadway as Marlene Dietrich in Piaf in 1981. Smart was later cast in a lead role as Charlene Frazier Stillfield on the CBS sitcom Designing Women, which she played from 1986 to 1991.

She was nominated for the Tony Award for Best Actress in a Play for the 2000 Broadway revival of The Man Who Came to Dinner, and would go on to win two Emmy Awards for her role as Lana Gardener on the NBC sitcom Frasier (2000–01), and a third Emmy in 2008 for her role as Regina Newley on the ABC sitcom Samantha Who? (2007–09).

Her film credits include The Brady Bunch Movie (1995), Guinevere (1999), Sweet Home Alabama (2002), I Heart Huckabees (2004), and The Accountant (2016). Between 2006 and 2007, she portrayed Martha Logan on the series 24, and later starred as Floyd Gerhardt on Noah Hawley's FX series Fargo (2015), which earned her a Critics' Choice Television Award as well as an Emmy Award nomination. Since 2017, she stars in the FX series Legion, also by Hawley.