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 | USS Luce | Wickes-class destroyer | sold for scrap | [ citation needed ] | |
| 16 February | USS Florida | Florida-class battleship | scrapped under London Naval Treaty of 1930 | [1] | |
| 24 March | USS Lansdale | Wickes-class destroyer | sold for scrap | [ citation needed ] | |
| 1 June | USS Hart | Wickes-class destroyer | sold for scrap | [ citation needed ] | |
| June | Río de la Plata | Protected cruiser | Hulked since 1921; scrapped 1932 | [2] | |
| 31 August | Extremadura | Protected cruiser | Scrapped 1932 | [3] | |
| 5 December | Emperador Carlos V | Armored cruiser | Hulked since 1923; stricken 1932; scrapped 1933 | [4] [5] [6] |