Benjamin St John Ackers (6 November 1839 – 18 April 1915) was a British Conservative Party politician. He sat in the House of Commons in 1885. At the 1880 general election he stood unsuccessfully in the borough of Gloucester.A petition was lodged against the election of the two Liberal Party candidates, which led to one of the two returns being voided. However, the writ was suspended, and no by-election was held. Ackers was appointed a deputy lieutenant of Gloucestershire in 1903.