Sir John Bourchier or Bourcher (c. 1595 – August 1660) was an English landowner and Puritan radical, who supported the Parliamentarian cause during the Wars of the Three Kingdoms.

He was brought up by his mother and maternal uncle Sir Francis Barrington, a devout Puritan jailed by Charles I for opposing the Forced Loan in 1627.

When Charles dissolved Parliament and sought to raise money through the forced loans in 1627, Sir John was one of those who refused.

In this place he was seized with so dangerous a fit of illness, that those about him who were his nearest relations, despairing of his recovery, and presuming that an acknowledgment from him of his sorrow, for the part he had in the condemnation of the King, might tend to procure some favour to them from those in power, they earnestly pressed him to give them that satisfaction.

But he being highly displeased with their request, rose suddenly from his chair, which for some days he had not been able to do without assistance; and receiving fresh vigour from the memory of that action, said, 'I tell you, it was a just act; God and all good men will own it.'