John St Aubyn (1613–1684) was an English politician who sat in the House of Commons of England in 1640.
[1] In April 1640, St Aubyn was elected Member of Parliament for Tregoney.
In April 1659 he was elected MP for St Ives in the Third Protectorate Parliament.
In 1659 he purchased St Michael's Mount from the Bassett family and it became his home.
He was one of the Cornish gentry who met at Truro in December 1659 to demand a free Parliament.