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.