The siege of Barcelona took place between 14 September and 19 October 1705 during the War of the Spanish Succession when a multinational Grand Alliance army led by Lord Peterborough, supporting the Habsburg pretender to the Spanish throne, captured the city of Barcelona from its Spanish Bourbonic defenders,
most of whom then joined the Habsburg army.
An attempted landing had been repulsed the previous year at the Battle of Barcelona. Following the city's capture by Peterborough, the Bourbons launched a concerted attempt to recapture it the following year during the siege of Barcelona, which failed. The city and Catalonia remained in Allied hands until reconquered by the Bourbons in 1714.