| Conflict: | Siege of Salvador |
| Partof: | the Dutch invasions of Brazil |
| Date: | April – May 1638 |
| Place: | Salvador, Bahia, Brazil |
| Map Type: | Brazil#South America |
| Map Relief: | yes |
| Result: | Portuguese-Spanish victory[1] [2] |
| Combatant1: |  Spain |
| Combatant2: | Dutch Republic |
| Commander1: | Giovanni di San Felice Luís Barbalho |
| Commander2: | John Maurice, Prince of Nassau-Siegen Johan van der Mast[3] |
| Strength1: | 1,000 |
| Strength2: | 4,600 (3,600 Dutch troops and 1,000 Brazilian auxiliaries) or 6,000[4] 30 or 45 ships |
| Casualties1: | Light |
| Casualties2: | 500 killed 30 captured Large amount of abandoned military equipment |
The siege of Salvador was a siege that took place between April and May 1638, during the Dutch–Portuguese War and Eighty Years' War. The governor of the Dutch colony in Brazil, John Maurice, Prince of Nassau-Siegen, commanding the army of the Dutch West India Company, with vastly superior forces and a supporting fleet under Johan van der Mast, put the city of Salvador under siege. The Portuguese and Spanish defenders, commanded by Giovanni di San Felice, Count of Bagnolo, and Luís Barbalho, managed to resist the Dutch attacks until they gave up taking the city and withdrew with several casualties.