The list of ship commissionings in 1998 includes a chronological list of all ships commissioned in 1998.
| Operator | Ship | Flag | Class and type | Pennant | Other notes | |
|---|---|---|---|---|---|---|
| 31 January | 
Royal Australian Navy
|
Farncomb | Collins-class submarine | SSG 74 | ||
| 15 March | 
Egyptian Navy
|
Sharm El-Sheik | Oliver Hazard Perry-class frigate | F901 | former USS Fahrion | |
| 18 April | 
Royal Netherlands Navy
|
Rotterdam | Rotterdam-class amphibious transport dock | L800 | ||
| 14 May | 
Royal Navy
|
Penzance | Sandown-class minehunter | M106 | ||
| 25 July | 
United States Navy
|
Harry S. Truman | Nimitz-class aircraft carrier | CVN-75 | ||
| 30 September |
Royal Navy
|
Ocean | Ocean-class landing platform helicopter | L12 | ||
| 6 October |
Royal Navy
|
Pembroke | Sandown-class minehunter | M107 |