The list of ship decommissionings in 2004 includes a chronological list of all ships decommissioned in 2004.
| Operator | Ship | Flag | Class and type | Fate | Other notes | ||
|---|---|---|---|---|---|---|---|
| 17 August | Scrapped | ||||||
| 25 August | Awaiting disposal in fleet exercises | ||||||
| 30 August | Sunk as a target | ||||||
| 10 September | Nuclear submarine recycling | ||||||
| 24 September | Sunk as a target | ||||||
| 30 September | Inactive | Ship's Maintenance Facility in Philadelphia, Pennsylvania | |||||
| 1 October | Awaiting disposal | ||||||
| 1 October | Undergoing scrapping | ||||||
| 14 October | Nuclear submarine recycling | ||||||
| 19 October | Sold to Estonia | ||||||
| 25 October | Type 42 destroyer | Scrapped | |||||
| 5 November | Type 42 destroyer | Scrapped | |||||
| 15 November | Sold to Estonia | ||||||
| 3 December | Awaiting disposal |