John Moresby | |
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 | |
| Born | 15 March 1830 Allerford, Somerset, England |
| Died | 12 July 1922 (aged 92) Fareham, Hampshire, England |
| Allegiance |  United Kingdom |
| Service |  Royal Navy |
| Rank | Rear admiral |
| Commands | HMS Endymion |
| Relations | Fairfax Moresby (father); L. Adams Beck (daughter) |
Rear Admiral John Moresby (15 March 1830 – 12 July 1922) was a British naval officer who explored the coast of New Guinea and was the first European to discover the site of Port Moresby.