John Crabbe (before 1305 – 1352) was a Flemish merchant, pirate and soldier who was active for around 35 years of his life. He defended Berwick Castle for the Scots against English forces in 1318, but after being captured by the English in 1332 assisted the English when they again besieged at Berwick in 1333, and became a loyal servant of Edward III, for whom he also fought at the Battle of Sluys.