List of ship decommissionings in 1966
The list of ship decommissionings in 1966 includes a chronological list of all ships decommissioned in 1966.
| Date | Operator | Ship | Class and type | Fate | Other notes |
| 25 February | Finnlines | ' | Ferry | Renamed Finndana | |
| 2 May | ' | Scrapped | Reserve until stricken in 1969 | ||
| 1 October | Finnlines | ' | Ferry | Chartered to TT-Line | |
| Date uncertain | ' | Disposed | Returned to the United States Navy |