The list of ship commissionings in 1931 includes a chronological list of all ships commissioned in 1931.
| Operator | Ship | Flag | Class and type | Pennant | Other notes | |
|---|---|---|---|---|---|---|
| 21 March |  Royal Netherlands Navy | Van Nes | Admiralen-class destroyer | VN | ||
| 20 July | Royal Netherlands Navy | O 12 | O 12-class submarine | O 12 | ||
| 28 July | Royal Netherlands Navy | O 15 | O 12-class submarine | O 15 | ||
| 1 October | Royal Netherlands Navy | O 13 | O 12-class submarine | O 13 | ||
| Uncertain |  Argentine Navy | Almirante Brown | Veinticinco de Mayo-class cruiser | C-1 | acquired from Italy | |
| Uncertain | Argentine Navy | Veinticinco de Mayo | Veinticinco de Mayo-class cruiser | C-2 | acquired from Italy |
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