| Ernest Ferdinand, Duke of Brunswick-Lüneburg | |
| House: | House of Guelph |
| Father: | Ferdinand Albert I, Duke of Brunswick-Lüneburg |
| Mother: | Christine of Hesse-Eschwege |
| Spouse: | Eleonore Charlotte of Courland |
| Issue: | August William Christine Sophie Frederica George Louis George Frederick Anne Marie Frederick Charles Ferdinand |
| Birth Date: | 4 March 1682 |
| Birth Place: | Osterholz |
| Death Place: | Brunswick |
Ernest Ferdinand of Brunswick-Wolfenbüttel-Bevern (4 March 1682 in Osterholz - 14 April 1746 in Brunswick) was a titular Duke of Brunswick and Lüneburg. He was Prince of Brunswick-Bevern and founder of the younger Brunswick-Bevern line.
He was born in 1682 as the fourth son of Duke Ferdinand Albert I of Brunswick-Bevern and his wife, Landgravine Christine of Hesse-Eschwege. On 1 May 1706, he became a colonel in the Prussian army. In December of that year he succeeded his twin brother, Ferdinand Christian (d. 1706) as provost of the chapters of St. Blaise and St. Cyriakus in Brunswick.
On 1 March 1735, his elder brother, Duke Ferdinand Albert II of Brunswick-Bevern inherited Brunswick-Wolfenbüttel. Ferdinand Albert II then gave Brunswick-Bevern to Ernest Ferdinand as an apanage.
Ernest Ferdinand died in Brunswick in 1746. He was the founder of the younger Brunswick-Bevern line, which died out with the death of his son Frederick Charles Ferdinand in 1809
On 4 August 1714, he married Eleonore Charlotte of Courland (1686-1748), daughter of Frederick Casimir Kettler, with whom he had thirteen children: