The 'Battle of Cape Burnas' was a naval engagement between warships of the Soviet and Romanian navies near the Burnas lagoon, a marine lagoon then in Romania and now in Ukraine (1 October 1942).

On 1 October 1942, the Soviet 'M' class submarine M-118 attacked and sank the German transport ship Salzburg, which was carrying some 2,000 Soviet prisoners of war. After delivering its attack, the submarine was located by a German Blohm und Voss Bv 138C three-engined maritime patrol flying boat, and the Romanian gunboats Sublocotenent Ghiculescu and Stihi Eugen were despatched to the scene. The two Romanian warships attacked the Soviet submarine with depth charges, sinking it with all hands.

It is worth noting, however, that there are alternative versions of the event. Surveys in the area have failed to find the wreck in the alleged location of the sinking, and this had raised the possibility that M-118 was lost to the German flying boat attack or as a result of entering Romanian mine barrage. Another version proposes that two Soviet submarines were confirmed to have been sunk by Romanian surface units: there are several Soviet submarines claimed to have been sunk by Romanian surface warships, but the two most probable claims are M-118 and Shch-206, the latter sunk on 9 July 1941.