List of ship launches in 1840
The list of ship launches in 1840 includes a chronological list of some ships launched in 1840.
| Date | Ship | Class | Builder | Location | Country | Notes |
| 4 January | Hindostan | Merchantman | John Scott & Sons | Greenock |  UKGBIHMS|Lizard|1840|2sclass|Lizard|gunvessel |