Modruš is a village, former episcopal see, and current Latin Church Catholic titular see in the mountainous part of Croatia, located south of its municipality's seat Josipdol (Karlovac County), on the easternmost slopes of Velika Kapela mountain, in northern Lika.

[3] One of the counties in the Kingdom of Croatia-Slavonia (an autonomous kingdom within the Hungarian part of Austria-Hungary) was named Modruš-Rijeka County partially after the town.

From 1193 until 1553 Modruš and the large surrounding estate was owned by members of the Frankopan noble family, who were living in the Tržan castle above the medieval settlement.

The diocese was nominally restored in 2000 as Latin Titular bishopric of Modruš (Croatian = Curiate Italian) / Modrussa / Modrussen(sis) (Latin).

This Karlovac County geography article is a stub.