Sir Benjamin James Chapman, 4th Baronet (9 February 1810 – 3 November 1888) was an Anglo-Irish Whig politician and barrister. Chapman was the son of Sir Thomas Chapman, 2nd Baronet and Margaret Anne Fetherstonhaugh, and the brother of Sir Montagu Chapman, 3rd Baronet. He was educated at Trinity College Dublin, graduating with a Bachelor of Arts in 1830 and becoming a practicing barrister. In 1849, he married his cousin, Maria Fetherstonhaugh, daughter of Richard Steele Fetherstonhaugh and Dorothea née George. They had three children: Dora Marguerite Chapman, (1853–1907), and (1865–1914).