Sir John Churchill (1600–1673) was an English lawyer and politician.
His practice enjoyed great success during the 1630s and he was a member of the Middle Temple and deputy registrar of Chancery.
During the English Civil War he supported Charles I and his son Sir Winston served as a Cavalier in the king's army while John, too old for military service, served Charles in a civil capacity.
However, following the Battle of Naseby he withdrew his support for the king, sometime before the final Siege of Oxford.
Nonetheless, the victorious Parliamentarians imposed fines of £840 on him, but he was permitted to keep his property.