Sir John Carter (c. 1619 – 28 November 1676) was an English soldier, politician and administrator from Buckinghamshire, who served in the Parliamentarian army during the Wars of the Three Kingdoms.

As Lieutenant Colonel Carter, he was sent with forces from London to reinforce General Middleton and landed in Pembrokeshire in August 1644.

He was appointed a Commissioner for pious uses for the use of the Corporation of Denbigh on 17 November 1648 and was Constable of Conway Castle from 23 June 1649 to 15 February 1661.

As Governor of Conway, he received a commission from the Council of State on 18 August 1651 to raise a Troop of Horse.

The country people considered him as a rapacious oppressor and petty tyrant, and claimed that he forced the heiress of Kinmel to marry him.