Leonard Chappelow (1683–1768) was an English clergyman and orientalist.
He was born at Beverley, Yorkshire, the son of Edward Chappelow, a merchant.
He matriculated as a sizar at St John's College, Cambridge in 1709.
Ordained in 1716, he was rector of Childerley, Cambridgeshire from 1723, and of Little Hormead, Hertfordshire from 1730.
He published an Arabic grammar in 1730; also translations, and a Commentary on the Book of Job in 1752.