Adam Duncan, 1st Viscount Duncan
| The Viscount Duncan | |
|---|---|
| Portrait by John Hoppner, c.1798 | |
| Born | 1 July 1731 Dundee, Scotland | 
| Died | 4 August 1804 (aged 73) Cornhill-on-Tweed, England | 
| Allegiance | Great Britain United Kingdom | 
| Branch | Royal Navy | 
| Years of service | 1746–1804 | 
| Rank | Admiral | 
| Commands | HMS Royal Exchange HMS Valiant HMS Suffolk HMS Monarch HMS Blenheim HMS Foudroyant HMS Edgar North Sea Fleet | 
| Battles / wars | |
| Awards | Naval Gold Medal | 
Admiral Adam Duncan, 1st Viscount Duncan (1 July 1731 – 4 August 1804) was a Royal Navy officer best known for defeating the Batavian Navy at the 1797 Battle of Camperdown. The victory was one of the most significant naval battles in the French Revolutionary Wars.