The showbiz satire became the first film to win the top prize without an editing nomination since Ordinary People 34 years ago and just the 10th overall. Though Boyhood dominated the season early, Birdman's fortunes turned with the industry awards. It's now the eighth film to win Best Picture after sweeping the Producers Guild Awards, Screen Actors Guild Award for ensemble and Directors Guild Award.
Birdman also won Best Director for Alejandro G. Inarritu, original screenplay and cinematography. Inarritu's win means the DGA winner has matched the Oscar Best Director winner 60 times in the DGA's 67-year history. Birdman cinematographer Emmanuel Lubezki, who won last year for Gravity, is the first back-to-back winner in the category in 19 years and is the fifth overall.
Eddie Redmayne (The Theory of Everything) and Julianne Moore (Still Alice) took the lead acting awards. Redmayne, 33, is the eighth youngest Best Actor winner ever, while Moore, 54, is the 10th oldest Best Actress winner and just the second one after Shirley Booth to win while in her 50s.
J.K. Simmons took home the first award of night, Best Supporting Actor, for Whiplash, while Patricia Arquette won Best Supporting Actress for Boyhood to complete their awards sweeps. Moore, Simmons and Arquette are the 22nd, 23rd and 24th actors to win the Golden Globe, Critics' Choice Award, Screen Actors Guild Award, BAFTA and Oscar for the same role.
Grand Budapest, which co-led the field with Birdman with nine nominations, won costume design, makeup and hairstyling, production design and original score.
All eight Best Picture nominees won at least one award. Whiplash also won sound mixing and editing. American Sniper bagged sound editing and The Imitation Game earned adapted screenplay for Graham Moore, who shared that he tried to commit suicide at 16 and implored kids to "stay weird, stay different."
Common and John Legend, who received a standing ovation for their stirring performance of "Glory" from Selma, won original song.
See the full list of winners below.
Animated Feature: Big Hero 6
Animated Short: Feast
Cinematography: Emmanuel Lubezki, Birdman
Costume Design: Milena Canonero, The Grand Budapest Hotel
Documentary Short: Crisis Hotline: Veterans Press 1
Editing: Tom Cross, Whiplash
Foreign Language Film: Ida (Poland)
Live Action Short: The Phone Call
Makeup and Hairstyling: Frances Hannon and Mark Coulier, The Grand Budapest Hotel
Original Score: Alexandre Desplat, The Grand Budapest Hotel
Original Song: "Glory," music and lyric by Common and John Legend, Selma
Production Design: Adam Stockhausen (production design) and Anna Pinnock (set decoration), The Grand Budapest Hotel
Sound Editing: Alan Robert Murray and Bub Asman, American Sniper
Sound Mixing: Craig Mann, Ben Wilkins and Thomas Curley, Whiplash
Visual Effects: Paul Franklin, Andrew Lockley, Ian Hunter and Scott Fisher, Interstellar