Jean Isabel Smith (born September 7, 1957), credited professionally as J. Smith-Cameron, is an American actress. She gained prominence for her roles as Janet Talbot on the Sundance TV series Rectify (2013-2016) and Gerri Kellman on the HBO series Succession (2018-2023). For the latter, she received a nomination for the Primetime Emmy Award for Outstanding Supporting Actress in a Drama Series in 2022.

She spent a majority of her career in theatre making her Broadway debut in the 1982 Beth Henley play Crimes of the Heart. She went on to received a Tony Award for Best Featured Actress in a Play nomination for the Timberlake Wertenbaker play Our Country's Good (1989). She was also nominated for the Drama Desk Award for Outstanding Actress in a Play for Seán O'Casey's Juno and the Paycock (2014).

For her role in the film Nancy (2018) she was nominated for the Independent Spirit Award for Best Supporting Female. Other notable films include 84 Charing Cross Road (1987), Mighty Aphrodite (1995), Sabrina (1995), In & Out (1997), You Can Count on Me (2000), Margaret (2011), and Christine (2016). She's also acted in True Blood (2010-2011), Divorce (2016-2018), Search Party (2017-2020), and Fleishman Is in Trouble (2022).

Early life and education
Smith was born in Louisville, Kentucky, the daughter of architect Richard Sharp Smith and granddaughter of architect Richard Sharp Smith. She was raised in Greenville, South Carolina.

She attended Florida State University for one year and was enrolled in its School of Theatre, where she met film director Victor Nuñez, who cast her as a lead in his film Gal Young 'Un (1979). She also studied acting at HB Studio in New York City.

She began being credited as "J. Smith" in college out of concern that her first name, Jeannie, was too girlish. She added a family name, Cameron, when the Actors' Equity Association told her there was already a J. Smith, and there was a rule that two actors could not have the same professional name.