The 3rd Spanish Armada, also known as the Spanish Armada of 1597, was involved in a major naval event that took place between 18 October and 15 November 1597 as part of the Anglo–Spanish War. The attack of the armada, which was the third attempt by Spain to invade or raid the British Isles during the war, was ordered by King Philip II of Spain in revenge for the English attack on Cadiz following the failure of the 2nd Spanish Armada the previous year due to a storm. The Armada was executed by the Adelantado, Martín de Padilla, who was hoping to intercept and destroy the English fleet under Robert Devereux the 2nd Earl of Essex as it returned from the failed Azores expedition. When this was achieved, the Armada would go on to capture either the important port of Falmouth or Milford Haven and use those places as a base for invasion.

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.