The Battle of Chaul was a naval battle between the Portuguese and an Egyptian Mamluk fleet in 1508 in the harbour of Chaul in India. The battle ended in a Mamluk victory. It followed the Siege of Cannanore in which a Portuguese garrison successfully resisted an attack by Southern Indian rulers. This was the first Portuguese defeat at sea in the Indian Ocean.

The siege of Cannanore was a four-month siege, from 27 April 1507 to 27 August 1507, when troops of the local ruler, supported by the Zamorin of Calicut and Arabs, besieged the Portuguese garrison at St. Angelo Fort in Cannanore, in what is now the Indian state of Kerala. It followed the Battle of Cannanore, in which the fleet of the Zamorin was defeated by the Portuguese.