| Navy | The Soviet Navy |
| Type | Submarine |
| Class | S (Stalinec) |
| Pennant | |
| Mod | 3rd group (Type IX-modified-2) |
| Built by | Krasnoye Sormovo (Gorkiy, U.S.S.R) / Yard 112 |
| Ordered | |
| Laid down | 13 Sep 1938 |
| Launched | 25 Apr 1939 |
| Commissioned | 30 Jun 1942 |
| End service | |
| History | Northern fleet. Stricken on 29 December 1955. |
We don't have any commands listed for USSR S-103
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Notable events involving S-103 include:
29 May 1944
S-103 fires four torpedoes against the German auxiliary submarine chasers UJ 1209, UJ 1211 und UJ 1219 off the Laksfjord. The torpedoes missed their targets and S-103 was depth charged by UJ 1209.
23 Aug 1944
At 1111 hours S-103 fires two torpedoes against ' what is identified as ' a tug towing a barge off the Syltefjord. Both torpedoeds missed their target.
Over an hour later, at 1223 hours, S-103 fires three torpedoes against the German Gretchen (255 GRT). The three torpedoes missed their target.
28 Aug 1944
S-103 attacked a German convoy off the Kongsfjord. Four torpedoes were fired but none hit their intended target(s).