| Navy | The Royal Dutch Navy |
| Type | Submarine |
| Class | K VIII |
| Pennant | N 39 |
| Built by | Koninklijke Maatschappij De Schelde (Vlissingen (Flushing), The Netherlands) |
| Ordered | 27 Jun, 1917 |
| Laid down | 1 Mar, 1919 |
| Launched | 23 Dec, 1922 |
| Commissioned | 21 Jun, 1923 |
| End service | 15 Jul, 1942 |
| Loss position | |
| History | Decommissioned on 15 July 1942. Commissioned into the Royal Australian Navy on 22 June 1943 as HMAS K 9. On 31 March 1944 she was decommissioned by the Royal Australian Navy and returned to the Royal Netherlands Navy that converted the ship into an oil hulk. On 9 June 1945 K IX was wrecked on Fiona Beach, Seal Rocks, on the central coast of New South Wales. For the complete service history of this ship see this website (offsite link). |

