List of ship decommissionings in 1918
# List of ship decommissionings in 1918

The list of ship decommissionings in 1918 includes a chronological list of ships decommissioned in 1918. In cases where no official decommissioning ceremony was held, the date of withdrawal from service may be used instead.

| Date | Operator | Ship | Pennant | Class and type | Fate and other notes |
| - | - | - | - | - | - |
| January 2 | United States Navy | Arroyo | SP-197 | Section patrol craft | Recommissioned 18 April 1918 |
| November 15 | United States Navy | Avis | SP-382 | Section patrol craft | Returned to pre-World War I civilian owner |
| November 29 | United States Navy | Arawan II | SP-1 | Section patrol craft | Returned to pre-World War I civilian owner |
| November | United States Navy | Acoma | SP-1228 | Section patrol craft | Returned to pre-World War I civilian owner |
| December 2 | United States Navy | A. G. Prentiss | ID-2413 | Tugboat | returned to owner |
| December 16 | United States Navy | Arroyo | SP-197 | Section patrol craft | Returned to pre-World War I civilian owner |
| December 19 | United States Navy | Avenger | SP-2646 | Section patrol craft | Returned to pre-World War I civilian owner |
| December | United States Navy | Abalone | SP-208 | Section patrol craft | Returned to pre-World War I civilian owner |
| unknown date | United States Navy | Annabelle | SP-1206 | Section patrol craft | Returned to pre-World War I civilian owner |
| unknown date | United States Navy | Arabia | ID-3434 | Section patrol craft | Sold |
