Ralph of Bristol (died 24 August 1232), also known as Radulphus de Bristollia, was the bishop of Kildare. He had previously acted as treasurer of St. Patrick's Cathedral, Dublin, adding sufficient ornamentation that allowed it to be converted into a cathedral. Ralph was appointed bishop of Kildare, the first Englishman to hold the post and instructed that Kildare Cathedral be rebuilt as it was in near ruins.