Mosor (Latin: Massarus), or Mount Mosor (Massarus Mons; Italian: Monte Massaro), is a mountain range in Croatia located near the city of Split on the Adriatic coast.

It belongs to Dinaric Alps, and stretches from the pass of Klis in the northwest to the Cetina River in the southeast.

The highest point is the eponymous Mosor peak at 1,339 m.a.s.l.

Mosor is mainly composed of karst — limestone rocks.

There are two alpine huts and many mountaineering paths on Mosor.