Sir John Dethick (died 1671) was Lord Mayor of London in 1656 during the Protectorate.
[2] He died in 1671 at his country estate at Tottenham in Middlesex and was buried in the church of St Andrew Undershaft in London.
[1] Dethick married firstly Ann, daughter of Francis Smallpiece of Norwich and widow of Thomas Anguish.
He married secondly Martha, daughter of Edmund Travers of London.
He married thirdly Anne, daughter of Thomas Jolliff of Leek in Staffordshire.