Quentin Tarantino has won two Academy Awards for screenwriting.
His first writing Oscar came at the 67th Academy Awards in 1995, when Pulp Fiction won the award then titled Best Screenplay Written Directly for the Screen. Tarantino shared that award with Roger Avary, who received story credit. Their screenplay was praised for its nonlinear structure, distinctive dialogue, and interlocking crime narratives.
Tarantino won his second screenplay Oscar at the 85th Academy Awards in 2013 for Django Unchained. That film was credited as an original screenplay written by Tarantino and combined a revenge story with elements of the Western and blaxploitation genres. He was also nominated for writing Oscars for Inglourious Basterds and Once Upon a Time in Hollywood.
The question refers specifically to wins, not nominations. Tarantino has received more than two writing nominations, and he has also won other major screenplay honors, including BAFTA awards. Those broader totals can cause confusion, but his Academy Award wins for screenwriting number two: Pulp Fiction and Django Unchained.