Sir Ralph Sydenham (died 1671) was an English politician who sat in the House of Commons from 1641 to 1642.
He supported the Royalist cause in the English Civil War.
[3] Sydenham followed the King to Oxford and was thus disabled from sitting in parliament on 29 September 1642.
[1] Following the Restoration in 1660, Sydenham was made Master of Charterhouse and remained in post until his death in 1671.
[4] In 1629, Sydenham married Mary, the widow of Sir Arthur Chichester, at St Mary Abbots Church, Kensington[5] and had a family.