Kevin Costner

Costner was born on January 18, 1955, in Lynwood, California, and grew up in Compton, California. His parents were William and Sharon Costner. He is the youngest of three boys, the second of whom died at birth. Sharon Rae Costner (née Tedrick) was a welfare worker, and William Costner was an electrician and a utilities executive. Costner's father's heritage originates with German immigrants to North Carolina in the 1700s, and Costner also has English, Irish, Scottish, and Welsh ancestry. Costner was raised Baptist. He was not academically inclined in school, but did play sports (especially football), take piano lessons, write poetry, and sing in the First Baptist Choir. He has said that watching the 1962 film How the West Was Won as a child inspired his love for Western films.

Costner has stated that he spent his teenage years in different parts of California as his father's career progressed. He has described this time as a period when he "lost a lot of confidence", having to make new friends often. Costner lived in Ventura, then in Visalia. Costner attended Mt. Whitney High School where he was in the marching band. Costner graduated from Villa Park High School in 1973. He played baseball at Villa Park and was teammates with Dennis Burtt. He earned a BA from California State University, Fullerton (CSUF) in 1978. While at CSUF, he became a brother in the Delta Chi fraternity.

Costner became interested in acting and dancing while in his last year of college. In 1978, while on an airplane returning from his honeymoon in Puerto Vallarta, Costner had a chance encounter with actor Richard Burton. At that time, Costner was uncertain about whether he should become an actor, and he approached Burton to ask his advice. Costner has said that Burton encouraged him to pursue acting. Costner has also stated that he asked Burton whether it was possible to be an actor without experiencing turmoil in one's private life; according to Costner, Burton replied that he thought it was possible. Costner credits Burton with inspiring him to become an actor.

Having agreed to undertake a job as a marketing executive, Costner began taking acting lessons five nights a week, with the support of his wife. His marketing job lasted 30 days. He took jobs that allowed him to develop his acting skills, by paying his tuition, including working on fishing boats, as a truck driver, and giving tours of movie stars' Hollywood homes. This work supported the couple while Costner attended auditions.