Soviet submarine K-3 was a K-class submarine of the Soviet Navy during World War II.
At first located in the Baltic Sea, she was relocated to the Northern Fleet on 8 November 1941. She engaged enemy shipping with torpedoes, with gunfire, and as a minelayer.
On 3 December 1941, after a failed torpedo attack, K-3 was damaged by depth charges from the German submarine chasers UJ-1403, UJ-1416, and UJ-1708. K-3 was forced to surface and engaged in a gun battle the three attacking units, sinking UJ-1708 and forcing the other two ships to withdraw.
K-3 was sunk on 21 March 1943 by depth charges from the German submarine chasers UJ-1102, UJ-1106, and UJ-1111.
| + Ships sunk by K-3 [1] | |||||
| Date | Ship | Flag | Tonnage | Notes | |
|---|---|---|---|---|---|
| 3 December 1941 | UJ-1708 | 470 GRT | Submarine chaser(artillery) | ||
| 30 January 1942 | Ingøy |  | 327 GRT | Freighter (mine)[2] | |
| 9 July 1942 | UJ-1110 | 527 GRT | Submarine chaser(mine)(also claimed by K-21) | ||
| 5 February 1943 | UJ-1108 | 462 GRT | Submarine chaser(torpedo) | ||
| 12 February 1943 | Fechenheim | 8,116 GRT | Freighter (mine)(damaged beyond repair) | ||
| Total: | 9,902 GRT | ||||
K-3 is the fifteenth-highest-scoring Soviet submarine (not counting ships sunk by mines she laid), with 9,048 GRT sunk.