The list of ship decommissionings in 1898 is a chronological list of ships decommissioned in 1898. 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 1898 instead.
| Date | Operator | Ship | Pennant | Class and type | Fate and other notes |
|---|---|---|---|---|---|
| September |  United States Navy | Nahant | Passaic-class monitor | Sold for scrap on 6 April 1904 | |
| September 11 | United States Navy | Passaic | Passaic-class monitor | Sold for scrap on 10 October 1899 | |
| September 22 | United States Navy | Catskill | Passaic-class monitor | Sold for scrap on 4 December 1901 |