This is a dynamic list and may never be able to satisfy particular standards for completeness. You can help by adding missing items with reliable sources.
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 |
See also
| Ship events in 1931 | |
|---|---|
| Ship launches | |
| Ship commissionings | |
| Ship decommissionings | |
| Shipwrecks | |