Solms-Braunfels was a County and later Principality with Imperial immediacy in what is today the federal Land of Hesse in Germany.

The main branch of the princely House of Solms-Braunfels became extinct with Georg Friedrich Victor in 1970.

Braunfels and Hungen Castles including their agricultural and forest estates were inherited by the last Prince's daughter Maria Gabrielle Princess of Solms-Braunfels (1918−2003) and her husband Hans Georg Count von Oppersdorff (1920−2003).

Since 1969, they and their offspring bear the name Count/Countess von Oppersdorff-Solms-Braunfels, with consent of the Hessian Ministry of the Interior.

An Austrian side branch (which had owned estates in Bohemia and Hungary until 1945) became extinct in 1989.