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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 [1] |
| 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 |