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 | ||
| 14 February |  United States Navy | Mahan | Arleigh Burke-class destroyer | DDG-72 | ||
| 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 | ||
| 25 April | United States Navy | McFaul | Arleigh Burke-class destroyer | DDG-74 | ||
| 14 May |  Royal Navy | Penzance | Sandown-class minehunter | M106 | ||
| 25 July | United States Navy | Harry S. Truman | Nimitz-class aircraft carrier | CVN-75 | ||
| 5 August | United States Navy | Bridge | Supply-class fast combat support ship | AOE-10 | ||
| 15 August | United States Navy | Bonhomme Richard | Wasp-class amphibious assault ship | LHD-6 | ||
| 30 September | Royal Navy | Ocean | Ocean-class landing platform helicopter | L12 | ||
| 6 October | Royal Navy | Pembroke | Sandown-class minehunter | M107 | ||
| 4 December | United States Navy | Donald Cook | Arleigh Burke-class destroyer | DDG-75 |