The Maine Celtics are an American professional basketball team in the NBA G League based in Portland, Maine, and are affiliated with the Boston Celtics. The Maine Celtics play their home games at the Portland Expo Building. Previously known as the Maine Red Claws, the Boston Celtics purchased the franchise in July 2019 from Maine Basketball, LLC, a company chaired by William Ryan Jr., and renamed the team the Maine Celtics in 2021.