Isenburg-Arnfels
1286 - 1379
Capital Circle Bench	Arenfels none none
Partitioned from Isenburg-Grenzau	1286
Extinct; to Isenburg-Wied	1379

Isenburg-Arnfels was the name of a state of the Holy Roman Empire, based around Bad Hönningen in modern Rhineland-Palatinate, Germany.

Isenburg-Arnfels was created upon the partition in 1286 of the lands of Count Henry II between his sons, the youngest Gerlach receiving his territories in and around Bad Hönningen. The castle of Arenfels, from which the name of the state is derived, was built by Count Henry II in 1258/9. In 1379 after the death of the last count, Isenburg-Arnfels was inherited by Count Gerlach of Isenburg-Wied.