She was up against fine actresses like Meryl Streep, Natalie Portman, Isabelle Huppert and Ruth Negga.
Thanking them, she said on Sunday: "You were so extraordinary. I look up to you all."
Lifting up the golden statuette, Stone, who stars as an aspiring actress in the film, said that it is a "beautiful symbol" to continue on her journey of doing good work.
She even thanked her co-star Ryan Gosling for their "incredible journey".
More Info: La La Land