| John de Bernewitz | |
| Native Name: | Johann Heinrich Karl von Bernewitz |
| Birth Date: | 27 December 1760 |
| Birth Place: | Dresden, Saxony |
| Death Date: | 12 December 1821 |
| Death Place: | Brunswick |
| Allegiance: | Duchy of Brunswick-Lüneburg United Kingdom |
| Branch: | Brunswick Army British Army |
| Serviceyears: | 1775–1821 (Brunswick) 1811–1821 (Britain) |
| Rank: | Lieutenant-General (Brunswick) Major-General (Britain) |
| Commands: | Black Brunswickers Brunswick Oels Infantry Brigade, 7th Division 7th Division Commandant of Brunswick |
| Battles: | |
| Awards: | Army Gold Medal Knight Commander of the Royal Guelphic Order |
Major-General Johann Heinrich Karl von Bernewitz, styled John de Bernewitz when in British service, (27 December 1760 – 13 December 1821) was a British Army officer who served as General Officer Commanding the 7th Division during the Peninsular War.
De Bernewitz was commissioned into the Army of the Electorate of Brunswick-Lüneburg in 1775.[1] He refused to join the Army of the Kingdom of Westphalia when Brunswick-Lüneburg was annexed by Westphalia in 1807. He then commanded the forces of Brunswick-Lüneburg during the rebellion by Frederick William, Duke of Brunswick-Wolfenbüttel in 1809.[1] He served under British command during the Peninsular War and commanded a British brigade at the Battle of Salamanca on 22 July 1812.[2] He also briefly served as General Officer Commanding the 7th Division in Spain from 23 September 1812 to 25 October 1812.[3]