List of ship decommissionings in 1931
The list of ship decommissionings in 1931 is a chronological list of ships decommissioned in 1931. In cases where no official decommissioning ceremony was held, the date of withdrawal from service may be used instead. For ships lost at sea, see list of shipwrecks in 1931 instead.
| Date | Operator | Ship | Class and type | Fate and other notes | Ref |
| 31 January | ' | sold for scrap | |||
| 16 February | ' | scrapped under London Naval Treaty of 1930 | |||
| 24 March | ' | sold for scrap | |||
| 1 June | ' | sold for scrap | |||
| June | ' | Protected cruiser | Hulked since 1921; scrapped 1932 | ||
| 31 August | ' | Protected cruiser | Scrapped 1932 | ||
| 5 December | Armored cruiser | Hulked since 1923; stricken 1932; scrapped 1933 |