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The list of ship decommissionings in 1920 includes a chronological list of all ships decommissioned in 1920.
| Operator | Ship | Class and type | Fate | Other notes | |
|---|---|---|---|---|---|
| 7 May |  United States Navy
|
Alabama | Illinois-class battleship | Target ship | [1] |
| 10 May | United States Navy
|
Kearsarge | Kearsarge-class battleship | Conversion to a crane ship, became Crane Ship 1 (AB-1) | Scrapped in 1955 |
| 15 May | United States Navy
|
Wisconsin | Illinois-class battleship | Sold for scrap in 1924 | |
| 29 May | United States Navy
|
Kentucky | Kearsarge-class battleship | Sold for scrap 1924 | |
| 30 September |  Royal Australian Navy
|
Encounter | Second class protected cruiser | Converted to an accommodation ship | |
| October |  Imperial German Navy
|
Roon | Armored cruiser | Scrapped |