The list of shipwrecks in 1866 includes ships sunk, foundered, grounded, or otherwise lost during 1866.
| Operator | Ship | Flag | Class | Cause | Location | Notes | |
|---|---|---|---|---|---|---|---|
| 13 May | General Grant | United States | Barque | ran aground and sank | Auckland Islands south of New Zealand | 68 lost, 55 passengers and 13 crew. Several attempts to salvage gold. |
| Ship events in 1866 | |||||||||||
| Ship launches: | 1861 | 1862 | 1863 | 1864 | 1865 | 1866 | 1867 | 1868 | 1869 | 1870 | 1871 |
| Ship commissionings: | 1861 | 1862 | 1863 | 1864 | 1865 | 1866 | 1867 | 1868 | 1869 | 1870 | 1871 |
| Ship decommissionings: | 1861 | 1862 | 1863 | 1864 | 1865 | 1866 | 1867 | 1868 | 1869 | 1870 | 1871 |
| Shipwrecks: | 1861 | 1862 | 1863 | 1864 | 1865 | 1866 | 1867 | 1868 | 1869 | 1870 | 1871 |