Can a foreign film win Academy Award for best picture?

Yes, a foreign language film can win an Academy Award for Best Picture. The winner of the award is not required to be in English. There have been multiple instances where foreign films have taken home the top prize. For example, "Parasite" (2019), a South Korean film directed by Bong Joon-ho, won the award for Best Picture, along with Best Director, Best International Feature, Best Original Screenplay, and Best Editing.