List of ship launches in 1903
The list of ship launches in 1903 is a chronological list of ships launched in 1903. In cases where no official launching ceremony was held, the date built or completed may be used instead.
| Date | Ship | Class and type | Builder | Location | Country | Notes |
| 12 January | Armstrong Whitworth | Elswick |  UKGBIUSS|Pike|SS-6|2sclass|Plunger|submarine|2 |