Sir John Buck or Sir John Bucke (c. 1566 – c. 1648) was an English landowner and politician who sat in the House of Commons in 1601.
He matriculated at Magdalen Hall, Oxford under date 25 February 1581, aged 15.
From 1591 he fought in the Netherlands campaign with the English army under Sir Francis Vere.
The following year he was in charge of a company of infantry and fought with distinction notably at the Siege of Steenwijk.
This article about a 17th-century member of the parliament of England (up to 1707) is a stub.