Portrait of a Clergyman — sometimes called Portrait of a 17th Century Clergyman or The Unknown Clergyman — is an oil on canvas portrait painting by Guilliam de Ville (ca. 1614–1672) dated 1639. The identity of the subject, an elderly clergyman, is unknown. It is owned by the Redwood Library and Athenaeum (Identifier: PA.125), Newport, Rhode Island, USA, where it hangs. De Ville was a Dutch painter of portraits and still lifes, born in Amsterdam and active in England. Only one other known painting by de Ville (a still life) survives.