"Whiplash" is the story of a talented young drummer who pursues perfection at any cost under the direction of a ruthless instructor. It was directed and written by Damien Chazelle, and starred Miles Teller and JK Simmons, the Sundance website said.
The film also won the audience award for best U.S. drama.
"Rich Hill" is about a rural U.S. town in which children must make heartbreaking choices, find comfort in fragile family bonds and dream of the future. The film was directed by Andrew Droz Palermo and Tracy Droz Tragos.
"Alive Inside: A Story of Music & Memory," directed by Michael Rossato-Bennett won the audience award for best U.S. documentary.
"Return to Homs" won the World Cinema Jury Prize for documentary and "To Kill a Man" won the World Cinema Jury Prize for drama, the website said.