| Navy | The Royal Dutch Navy |
| Type | Submarine |
| Class | O 12 |
| Pennant | |
| Built by | Koninklijke Maatschappij De Schelde (Vlissingen (Flushing), The Netherlands) |
| Ordered | 4 Oct 1927 |
| Laid down | 20 Oct 1928 |
| Launched | 8 Nov 1930 |
| Commissioned | 20 Jul 1931 |
| Lost | 14 May 1940 |
| History | When Germany invades Holland on 10 May 1940, HrMs O 12 was undergoing maintenance at the Rijkswerf (Navy Yard) at Den Helder. On 14 May 1940 she was scuttled to prevent her capture by the Germans. She was raised shortly afterwards and taken to the Wilton-Feijenoord shipyard at Schiedam for repairs. Commissioned by the Germans as UD-2 on 30 January 1943. |
Commands listed for HNMS O 12
Please note that we're still working on this section
and that we only list Commanding Officers for the duration of the Second World War.
| Commander | From | To | |
| 1 | luitenant ter zee 1e klasse (Lt.Cdr.) Johan Willem Ort, RNN | 23 Aug 1939 | 22 Sep 1939 |
| 2 | luitenant ter zee 2e klasse (Lt.) Jan Metz, RNN | 22 Sep 1939 | 18 Nov 1939 |
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