The list of ship decommissionings in 1979 includes a chronological list of all ships decommissioned in 1979.
| Operator | Ship | Flag | Class and type | Fate | Other notes | |
|---|---|---|---|---|---|---|
| 2 January | Svea Line (Finland) | Fennia |  Finland
|
ferry | Chartered to SAGA Linjen | |
| January | Tor Line | Tor Scandinavia |  Sweden
|
Cruiseferry | Chartered to Holland Expo | |
| 1 February | SAGA Linjen | Fennia | Finland
|
ferry | End of charter, returned to Svea Line (Finland) | |
| 26 February | Holland Expo | Tor Scandinavia | Sweden
|
Cruiseferry | End of charter, returned to Tor Line | |
| February | Stena Line | Stena Oceanica | Sweden
|
ferry | Rebuilt into Stena Saga | |
| 26 April | Rederi AB Slite | Diana | Sweden
|
ferry | Sold to Oy Vaasa-Umeå Ab | Renamed Botnia Express; chartered for Rederi AB Slite |
| 15 June | Rederi AB Slite | Botnia Express | Finland
|
ferry | Entered traffic with Oy Vaasa-Umeå Ab | Under charter from Oy Vaasa-Umeå Ab |
| September | Rederi AB Slite | Diana II av Slite | Sweden
|
Cruiseferry | Renamed Diana II | Continued in same traffic |
| September | Italia Crociere | Galileo Galilei |  Italy
|
Cruise ship | Laid up; sold to Chandris Fantasy Cruises in 1983 | Renamed Galileo |