Frederick William, Duke of Brunswick-Wolfenbüttel
| Frederick William | |
|---|---|
Portrait by Johann Christian August Schwartz, 1809 | |
| Duke of Brunswick-Lüneburg Prince of Brunswick-Wolfenbüttel | |
| Reign | 16 October 1806 – 8 July 1807 |
| Predecessor | Charles William Ferdinand |
| Duke of Brunswick | |
| Reign | 26 October 1813 – 16 June 1815 |
| Successor | Charles II |
| Born | 9 October 1771 Brunswick, Brunswick-Wolfenbüttel (now Brunswick, Germany) |
| Died | 16 June 1815 (aged 43) Quatre Bras, Netherlands (now Genappe, Belgium) |
| Spouse | |
| Issue More... | Charles II, Duke of Brunswick William, Duke of Brunswick |
| House | Brunswick-Bevern |
| Father | Charles William Ferdinand, Duke of Brunswick |
| Mother | Princess Augusta of Great Britain |
Frederick William, Duke of Brunswick-Wolfenbüttel (German: Friedrich Wilhelm; 9 October 1771 – 16 June 1815), was a German prince and Duke of Brunswick-Lüneburg and Oels. Nicknamed "The Black Duke", he was a military officer who led the Black Brunswickers against French domination in Germany. He briefly ruled the state of Brunswick-Wolfenbüttel from 1806 to 1807 and again from 1813 to 1815.