The list of ship commissionings in 1978 includes a chronological list of all ships commissioned in 1978.
| Operator | Ship | Flag | Class and type | Pennant | Other notes | |
|---|---|---|---|---|---|---|
| 9 January | Birka Line | Prinsessan |  Finland | Ferry | Former Finnhansa with Finnlines | |
| 16 January | Sessan Linjen | Fennia | Finland | Ferry | chartered from Svea Line (Finland) | |
| February | Kefalliniki Sa | Ainos |  Greece | Ferry | ex-Manic with La Traverse Nord-Sud Ltd | |
| 15 March | .svg.png){kind=small} Imperial Iranian Navy | Khadang | Kaman-class fast attack craft | P223 | ||
| 23 March | Imperial Iranian Navy | Joshan | Kaman-class fast attack craft | P225 | ||
| 31 March | Imperial Iranian Navy | Paykan | Kaman-class fast attack craft | P224 | ||
| 31 March | Imperial Iranian Navy | Falakhon | Kaman-class fast attack craft | P226 | ||
| 31 March | Imperial Iranian Navy | Shamshir | Kaman-class fast attack craft | P227 | ||
| 3 April | Minoan Lines | Knossos | Greece | Ferry | Former Saga with Swedish Lloyd | |
| 24 April | Svea Line (Finland) | Fennia | Finland | Ferry | In Silja Line traffic | |
| 10 May | Polferries | Rogalin |  Poland | Ferry | ex-Aallotar chartered by Polferries from Effoa | |
| 13 May | DFDS Seaways | Dana Anglia |  Denmark | Ferry | ||
| 9 June | P&O Normandy Ferries | nf Tiger |  United Kingdom | Ferry | ex-Katteget with Jydsk Færgefart A/S | |
| 22 August | Imperial Iranian Navy | Gorz | Kaman-class fast attack craft | P228 | ||
| 1 September | Stena Line | Stena Oceanica |  Sweden | Ferry | Former Patricia with Swedish Lloyd. Heavily rebuilt before entered service. | |
| 26 October |  Royal Netherlands Navy | Kortenaer | Kortenaer-class frigate | F807 | ||
| 11 September | Imperial Iranian Navy | Gardouneh | Kaman-class fast attack craft | P229 | ||
| 9 November | Stena Line | Stena Baltica | Sweden | Ferry | Former Peer Günt with Aarhus-Oslo Linie |
See also
| Ship events in 1978 | |||||||||||
| Ship launches: | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 | 1983 |
| Ship commissionings: | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 | 1983 |
| Ship decommissionings: | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 | 1983 |
| Shipwrecks: | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 | 1983 |