"Pulp Fiction" producer faces up to 24 years in jail.
He is already serving a 23-year jail term for sex crimes in New York.
Prosecutors painted a picture of a predatory ogre who used his physical size and his professional prowess to rape and abuse women with impunity.
Weinstein used his power to prey on and silence women, said prosecutor Marlene Martinez.
Jurors heard testimony from women who said they had been tricked into being alone with Weinstein in his hotel room.
Weinstein believed he was so powerful that people would excuse his behavior, Martinez said.