Thomas Cartwright (c. 1635 in Hertfordshire - 27 December 1703) was a 17th century English architect. Cartwright was the architect employed by Sir Robert Clayton, president of the St Thomas' Hospital, to rebuild and the hospital and nearby St Thomas Church on the south bank of the River Thames opposite the Houses of Parliament in London. He also designed Portland College for the Disabled in Sherwood Forest near Mansfield, Nottinghamshire