Sir John Nicholas (1624 – 9 Jan 1705) was an English courtier and Member of Parliament.
After being educated both privately and at Winchester College (1637–40) and Queen's College, Oxford (1641) he spent some time travelling abroad in France before entering the Middle Temple in 1647 to study law.
He also served as a Justice of the Peace for both Wiltshire and Surrey, and as a Commissioner of Assessment for several counties.
He was Keeper of Windsor Great Park from 1669 to 1671 and Deputy Lieutenant of Dorset from 1672 to 1674.
He was then elected to serve in three consecutive Parliaments for Wilton, sitting until 1687.