List of ship decommissionings in 1940
# List of ship decommissionings in 1940

The list of ship decommissionings in 1940 includes a chronological list of ships decommissioned in 1940. In cases where no official decommissioning ceremony was held, the date of withdrawal from service may be used instead. Notably, several destroyers were decommissioned by the United States Navy during 1940 for immediate transfer to the Royal Navy under the Destroyers for Bases Agreement between the two nations.

| Date | Operator | Ship | Class and type | Fate and other notes |
| - | - | - | - | - |
| 9 September | United States Navy | Aaron Ward | Wickes-class destroyer | decommissioned at Halifax and transferred to the Royal Navy |
| 9 September | United States Navy | Abel P. Upshur | Clemson-class destroyer | decommissioned at Halifax and transferred to the Royal Navy as HMS Clare |
| 23 September | United States Navy | Abbot | Wickes-class destroyer | decommissioned at Halifax and transferred to the Royal Navy |
| 11 October | United States Navy | Evans | Wickes-class destroyer | transferred to the Royal Navy |
| 11 October | United States Navy | Philip | Wickes-class destroyer | transferred to the Royal Navy |
| 11 October | United States Navy | Wickes | Wickes-class destroyer | transferred to the Royal Navy |
| 26 November | United States Navy | Fairfax | Wickes-class destroyer | transferred to the Royal Navy |
| 26 November | United States Navy | Sigourney | Wickes-class destroyer | transferred to the Royal Navy |
