Benjamin Lethieullier (1729-1797), was a British politician who sat in the House of Commons between 1768 and 1797. Lethieullier was the son of Christopher Lethieullier, director of the Bank of England, and his wife Sarah Lascelles who was daughter of Edward Lascelles, and widow of Joshua Iremonger of Wherwell, Hampshire. In 1768 Lethieullier was returned as Member of Parliament for Andover and retained the seat 29 years. In 1784 he was returned both for Andover and Midhurst and chose to sit again for Andover. Lethieullier died unmarried on 5 December 1797 .