Richard Penn, Jr. (27 May 1735 – 27 May 1811, Richmond, Surrey, England) served as the lieutenant governor of the Province of Pennsylvania from 1771 to 1773, and was later a member of the British Parliament.
Penn, of Laleham in Middlesex, was the second son of Richard Penn, Sr. (1706–1771) and the grandson of William Penn, the founder of Pennsylvania. He was educated at Eton College and St John's College, Cambridge before joining the Inner Temple. In 1763 he and his brother John visited Pennsylvania, of which his family were still sole proprietors. He was qualified as a councilor on 12 January 1764. In 1771 he returned to Pennsylvania and was appointed lieutenant governor. He soon became acting governor when his brother returned to England to attend to the colony's legal interests. He proved popular with the provincials, taking much care over their commercial interests, but less so with his uncle, the proprietor. After two years he was supplanted by the re-appointment of his brother as governor.
On 21 May 1772, at Christ Church, Philadelphia, he married Mary "Polly" Masters, daughter of the late William Masters of Philadelphia. The bride's mother gave them a splendid city house as a wedding present. Penn entertained members of the Continental Congress at his Philadelphia city house, a Virginia delegate, Colonel George Washington, being among his guests.
Richard Penn was elected a trustee of the College and Academy of Philadelphia (now the University of Pennsylvania) in 1772, serving as president of the board in 1773 and 1774. With the coming of the Revolution, he retired and returned to England in the summer of 1775, when the Continental Congress entrusted him with the Olive Branch Petition to the King. George III refused to accept the petition, but Penn gave evidence to the House of Lords on the colonies' attitudes toward independence.