The list of ship decommissionings in 1904 includes a chronological list of ships decommissioned in 1904. 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 1904 instead.
| Date | Operator | Ship | Pennant | Class and type | Fate and other notes |
|---|---|---|---|---|---|
| August 20 |  United States Navy | Moccasin | Submarine Torpedo Boat No. 5 | Plunger-class submarine | to reserve at Norfolk, Virginia until shipped to the Philippines [1] |