According to People, the pair, who had been together for over two decades, split over the summer.
"Actress Susan Sarandon and her partner of 23 years, actor Tim Robbins, have announced that they separated over the summer," said Sarandon's rep Teal Cannaday in a statement. "No further comments will be made."
The couple met on the set of Bull Durham, and they have two sons together, Jack, 20, and Miles, 17. They were never married.