The Capture of Ootmarsum in 1597 was a short siege, that took place during the Eighty Years' War and the Anglo–Spanish War by a Dutch and English army led by Count Van Duivenvoorde while Maurice of Nassau was besieging Oldenzaal. The siege lasted from 19 to 21 October, where the Spanish garrison of Ootmarsum under the governor, Otto Van Den Sande, surrendered and was then occupied by the besiegers. The siege was part of Maurice's successful offensive against the Spaniards during the same year.

The Anglo-Spanish War (1585–1604) was an intermittent conflict between the Habsburg Kingdom of Spain and the Kingdom of England that was never formally declared. It began with England's military expedition in 1585 to what was then the Spanish Netherlands under the command of the Earl of Leicester, in support of the Dutch rebellion against Spanish Habsburg rule.