Sir Nicholas Rainton (1569–19 August 1646) was an English merchant who was Lord Mayor of London in 1632.
He was the third son of Robert Rainton of Heighington, Lincolnshire and was baptised in the parish of Washingborough on 10 June 1569.
On 16 November 1602 he married Rebecca Moulson at the church of St Christopher le Stocks in the City of London.
[3] In 1616 Rainton bought the manor of Worcesters at Enfield in Middlesex from the Cecil family, and in 1629 began the construction of a house, Forty Hall, on the estate.
[1] There are two versions of a portrait of Rainton: one at Forty Hall, the other at St Bartholomew's Hospital.