Fortescue is an 1846 three-volume novel by the Irish writer James Sheridan Knowles. He had for many years been a leading West End playwright, but by this stage his career was in gradual decline, and he turned to novel-writing. It is set in Cork where Knowles was born and raised. The New Monthly Magazine review believed that the novel may have been semi-autobiographical. It was serialised in The Sunday Times. It was published in New York by Harper Brothers in 1847.