| Conflict: | Action of 30 May 1564 |
| Partof: | Northern Seven Years' War |
| Date: | 30–31 May 1564 |
| Place: | Between Gotland and Öland, Baltic Sea |
| Result: | Dano-Lübeckian victory |
| Combatant1: |  Sweden |
| Combatant2: |  Denmark Lübeck |
| Commander1: | Jakob Bagge |
| Commander2: | Herluf Trolle Friedrich Knebel |
| Strength1: | 35 vessels, 3,500 sailors 1,700 soldiers |
| Strength2: | 26 ships, 4,600 sailors 10 ships, 2,018 sailors |
| Casualties1: | 1 ship, flagship Mars with approximately 800 sailors, additionally 101 sailors were killed on other ships |
| Casualties2: | 1 ship, Lange Bark sunk on the 30th losses unknown, and approximately 300 boarders on the Mars |
The first battle of Öland (sv|Första slaget vid Ölands norra udde) took place on 30–31 May 1564 between the islands of Gotland and Öland, between a fleet of Allied ships, the Danes under Herluf Trolle and the Lübeckers under Friedrich Knebel, and a Swedish fleet of 23 or more ships under Jakob Bagge. It was an Allied victory.
Only some of the ships on each side were involved, the rest being unable to join or continue their part in the battle due to the wind. On 30 May, Danish flagship Fortuna was damaged and Lange Bark sunk, but on 31 May the Swedish ship Mars was boarded by Byens Løffue, Engel, and Fuchs before catching alight and exploding, killing most of its crew and 300 boarders. Jakob Bagge and his Second,, were taken prisoner. Swedish casualties apart from in this ship were 101. Fleming took over the fleet and sailed it back to Älvsnabben, while the Danes sailed to Copenhagen.