The list of ship commissionings in 1984 includes a chronological list of all ships commissioned in 1984.
| Operator | Ship | Flag | Class and type | Pennant | Other notes | |
|---|---|---|---|---|---|---|
| 12 January |  Royal Netherlands Navy
|
Haarlem | Alkmaar-class minehunter | M853 | ||
| 12 April | Royal Netherlands Navy
|
Harlingen | Alkmaar-class minehunter | M 854 | ||
| 22 June |  Chilean Navy
|
Almirante Cochrane | County-class destroyer | D12 | Purchase date from the United Kingdom for ex-HMS Antrim | |
| 24 June |  United States Navy
|
Rentz | Oliver Hazard Perry-class frigate | FFG-46 | ||
| 18 July | Royal Netherlands Navy
|
Scheveningen | Alkmaar-class minehunter | M855 | ||
| 21 July |  Royal Australian Navy
|
Darwin | Adelaide-class frigate | FFG 04 | ||
| September |  People's Liberation Army Navy
|
Changzheng 3 | Type 091 submarine | 403 | date of initial operational capability | |
| 12 December | Royal Netherlands Navy
|
Maassluis | Alkmaar-class minehunter | M856 |