Indo-British filmmaker Asif Kapadia's Amy won the Oscar for Best Documentary Feature.
Amy has been the critics favourite since making its premiere at the Cannes Film Festival last year. The film, which chronicles the life and death of musician, Amy Winehouse, has also won awards at the Golden Globes and BAFTA. Winehouse died in 2011 following a battle with drugs and alcohol.
Kapadia's documentary beat off competition from documentaries like Cartel Land, The Look of Silence, What Happened Miss Simone? and Winter on Fire: Ukraine's Fight for Freedom.
Kapadia, 44, is known for directing Senna in 2012 and Irrfan Khan-starrer The Warrior in 2003.
"Thank you to the Academy for showing love to the film. We wanted to show who Amy really was, a funny intelligent, witty and a special girl," Kapadia said.
Producer James Gay-Rees said the award was for all the fans and followers of Winehouse, whose support she had always sought.
However, Winehouse's father Mitch had earlier distanced himself from the documentary, calling it a disappointment.