| Conflict: | Battle of Fidonisi |
| Place: | Area of Fidonisi (actual name Snake Island), Black Sea |
| Date: | 14 July 1788 (N.S.) |
| Partof: | Russo-Turkish War |
| Commander1: | Marko Voinovich Fyodor Ushakov |
| Strength1: | 2 ships of the line 10 frigates 24 small vessels |
| Casualties1: | Not specified |
| Combatant2: | Ottoman Empire |
| Commander2: | Cezayirli Hasan Pasha |
| Strength2: | 17 ships of the line 8 frigates 3 bomb vessels 21 small vessels |
| Casualties2: | The lead ships out of action 1 flagship out of action 1 vessel lost |
| Result: | Russian victory |
The naval Battle of Fidonisi took place on 14 July 1788 (NS) between the fleets of the Russian Empire under Marko Voinovich's lead and the Ottoman Empire under Cezayirli Hasan Pasha during the Russo-Turkish War (1787–1792) in the area of Snake Island, which in Greek was called Fidonisi (Φιδονήσι). It was a Russian victory.[1] [2] [3]
On 10 July, the Turkish fleet under Kapudan Pasha (Grand Admiral) Hasan Pasha was seen to the NW by the Russian fleet, which had left Sevastopol under Rear-Admiral Count Voinovich (Voynovich), on 29 June, and had reached Tendra on 10 July. After three days of manoeuvering or lying becalmed in sight of one another, the fleets found themselves near the island of Fidonisi, about 100 miles south of Kinburn.
Voynovich formed a line on the port tack NE and then SE as the wind veered. The Turks bore up and attacked from windward just after 3 pm. The leading Russian ships, the frigates Berislav and Stryela, forced the leading Turks out of line, but were in danger of being cut off until the Russian second-in-command Fyodor Ushakov aboard Sv. Pavel closed the gap.
Hasan Pasha then attacked the leading Russian ships, while his Vice- and Rear-Admirals attacked Voynovich, but his ship damaged, Hasan himself had to leave the line and just before 5 pm the Turks withdrew.
The battle of Fidosini demonstrated Ushakov's high tactical abilities. The Ottoman fleet, using the advantage of speed, moved south. They had lost 1 xebec, which was sunk.
Between 15 and 17 July, the Russian and Turkish fleets manoeuvered to the west of the Crimea; on 18 July, the Turks had disappeared. They sailed back to Ochakov but made no attack.
The battle was depicted in the movie "Admiral Ushakov" by Mikhail Romm.