John Barrett (died 1693) was a colonel and head of the barony of the Cork Barrett family. Colonel Barrett is noted for raising a regiment of infantry for King James' Irish Army during the Williamite War. In 1690 following the Battle of the Boyne, he was forced to surrender Waterford. In 1691 the Williamite confiscation deprived Barrett, the head of the family at that time, of 12,000 acres (49 km2). He was killed in the French service at the Battle of Landen, alongside fellow Jacobite Patrick Sarsfield, in 1693.