Isenburg-Braunsberg was the name of a state of the Holy Roman Empire, based around the hill Braunsberg (near Anhausen in modern Rhineland-Palatinate, Germany).
It was created as a partition of Isenburg-Isenburg in 1199 (1210).
In 1338 Isenburg-Braunsberg became an Imperial County.
It slowly acquired territories of the County of Wied, being renamed to Isenburg-Wied in 1388.