English
| U-31 | Type VIIA |
| Feldpost Number | M 28 961 |
| Construction Yard | Deutsche Schiff- und Maschinenbau AG, (AG Weser) Bremen |
| Yard Number | 912 |
| Ordered | 1st Apr 1935 |
| Keel laid | 1st Mar 1936 |
| Launched | 25th Sep 1936 |
| Commissioned | 28th Dec 1936 |
| Baubelehrung | Marinelehr-und Reparaturwerkstatt, Wilhelmshaven / Lehrwerkstatt, Wilhelmshaven |
| Training, Flotillas and Duties | |
| 12.36 – 12.39 | U-Flottille Saltzwedel, Wilhelmshaven Frontboot (operational) |
| 01.40 – 03.40 | 2.U-Flottille, Wilhelmshaven Frontboot (operational) |
| Decommissioned | |
| 07.40 – 11.40 | 2.U-Flottille, Wilhelmshaven Frontboot (operational) |
| Commanders | |
| 28.12.36 – 08.11.38 | KL Rolf Dau see also: U-5 U-42 |
| 08.11.38 – 11.03.40 | KL Johannes Habekost |
| 08.07.40 – 02.11.40 | OL Wilfried Prellberg see also: U-19 |
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