The Battle of Portland was a naval battle fought between the English and Dutch navies in the English Channel in 1653 during the First Anglo-Dutch War.
Following the English defeat at the Battle of Dungeness, the Admiralty reorganized the English navy into squadrons for greater tactical control, following the Dutch navy's practices; the English also adopted the line-of-battle tactic which they would retain until World War II. In February 1653, Admiral Robert Blake's English fleet of 80 warships attempted to cut off the Dutch admiral Maarten Tromp's fleet in the English Channel as it returned from escorting a Dutch merchant convoy into the Atlantic Ocean. In the ensuing battle off the Isle of Portland, the English mounted six failed attempts to break the Dutch line, and Blake was wounded in the thigh. However, the English sunk 12 Dutch merchantmen attempting to make a run for it, against Tromp's orders; the Dutch were on the verge of running out of powder and shot by the time that the wounded Blake decided to call off further attacks. The battle restored English control over the Channel, and the Dutch later attempted to reopen the Channel at the Battle of the Gabbard.