William Augustus, Duke of Brunswick-Harburg | |
|---|---|
 William Augustus, Duke of Brunswick-Lüneburg-Harburg | |
| Born | 15 March 1564 Harburg |
| Died | 30 March 1642 (aged 78) Harburg |
| Noble family | House of Guelph |
| Father | Otto II, Duke of Brunswick-Harburg |
| Mother | Hedwig of East Frisia |
Duke William Augustus of Brunswick-Lüneburg-Harburg (15 March 1564 in Harburg – 30 March 1642 in Harburg) was Duke of Brunswick-Lüneburg-Harburg.