Family
- father Bill Costner:
- mother Sharon Costner:
- brother Daniel Craig Costner: Born in 1950; built the Midnight Star Casino in Deadwood, SD, which is owned by his brother
- brother Mark Douglas Costner: Born and died in 1953; lived for only six hours
- daughter Annie Costner: Born April 15, 1985; mother, Cindy Silva; made feature debut in "The Baby-Sitters Club" (1995)
- daughter Lily Costner: Born Aug. 4, 1986; mother, Cindy Silva; made feature debut in "The Baby-Sitters Club" (1995)
- son Joe T Costner: Born Jan. 13, 1988; mother, Cindy Silva
- son Liam Rooney: Born in 1996; mother, Bridget Rooney
- son Cayden Wyatt Costner: Born May 7, 2007; mother, Christine Baumgarten
- son Hayes Logan Costner: Born Feb. 12, 2009; mother, Christine Baumgarten
Companions
- Bridget Rooney: reportedly involved with Costner briefly in 1996; mother of Costner's son Liam
- wife Christine Baumgarten: Began dating in 1999; briefly split before getting engaged in June 2003; married Sep. 25, 2004 at Costner's ranch in Aspen, Colorado
- Christine Baumgarten: reportedly engaged as of spring 2000; no longer together
