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 born in 1682 as the fourth son of Duke Ferdinand Albert I of Brunswick-Bevern and his wife, Landgravine Christine of Hesse-Eschwege.

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.

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: This article about a German duke is a stub.