The list of ship decommissionings in 1899 includes a chronological list of all ships decommissioned in 1899.
| Date | Operator | Ship | Pennant | Class and type | Fate and other notes | Ref |
|---|---|---|---|---|---|---|
| unknown date |  United States Navy | Sangamon | Passaic-class monitor | Sold for scrap in 1905 | [1] |