| Navy | The Soviet Navy |
| Type | Submarine |
| Class | L (Leninec) |
| Pennant | |
| Mod | 4th group (Type XIII-modified) |
| Built by | Baltiyskiy Zavod (Leningrad, U.S.S.R.) / Yard 189. |
| Ordered | |
| Laid down | 10 Jun 1938 |
| Launched | 14 Jul 1940 |
| Commissioned | 31 Aug 1943 |
| End service | |
| History | Baltic fleet. Bombed by German aircraft at Leningrad before completion on 24 May 1942. Sunk in shallow water. Later raised and repaired. |
We don't have any commands listed for USSR L-21
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Notable events involving L-21 include:
17 Nov 1944
At 0355 hours 40 nautical miles north-west of the Stilo lighthouse, L-21 fires three torpedoes at what is identified as a small merchant of about 500 tons. All torpedoes missed their target.
23 Nov 1944
L-21 lays a minefield off the Stolpebank.
That same day the German merchant Eichberg (1923 GRT) hits one of these mines and sank in position 54°51'N, 17°59'E.
24 Nov 1944
The German merchant Elie (1837 GRT) hits a mine and sank in position 54°51N, 17°59'E. The mine was laid the previous day by the Russian submarine L-21.
Also on this day, L-21 torpedoed and sank the small Swedish passenger ship Hansa (563 GRT) 18 nautical miles north-west of Halskuk in position 58°02'N, 18°10'E.
22 Dec 1944
The German merchant Eberhard (749 GRT) hits a mine and sank in position 54°51'N, 17°59'E. The mine was possibly laid on 23 November 1944 by the Russian submarine L-21.
Also on this day, L-21 engages a so far unidentified enemy merchant with gunfire 16 nautical miles north of Br?sterort.
8 Mar 1945
L-21 lays a minefield off Hela.
14 Mar 1945
The German torpedo boats T-3 and T-5 (both 839 tons) are mined and sunk off Hela in position 54°39'N, 18°47'E. The mines were laid by the Soviet submarine L-21 on 8 March 1945.
15 Mar 1945
German U-boat U-367 (769 tons) was sunk in the Baltic Sea off Hela, in position 54°36'N, 18°52'E, after hitting a mine laid by the Soviet submarine L-21 on 13 March 1945.
18 Mar 1945
While on patrol east of the Stolpebank, at 2305 hours L-21 fires three torpedoes at a so far unidentified merchant in a German convoy. All torpedoes missed their target.
At 2332 hours L-21 again fires three torpedoes at a so far unidentified merchant in another German convoy. Once again all torpedoes missed their target.
23 Mar 1945
L-21 torpedoed and sank the German auxiliary patrol vessel V 2022/E Colzmann (581 GRT) off Kolberg in position 55°24'N, 17°00'E.
24 Mar 1945
L-21 torpedoed and sank the German tug Erni (105 GRT) off Kolberg in position 55°10'N, 17°36'E.
10 Apr 1945
The German destroyer Z-43 (2519 tons) is mined and damaged off Hela in position 54°36'N, 18°52'E. The mines were laid by the Soviet submarine L-21 on 8 March 1945.