The Šar mountain (Serbian Шар планина, Šar Planina; Albanian Malet e Sharrit, Sharr) is a mountain on the border of Serbia and Montenegro and the Republic of Macedonia.

The mountain is around 80 kilometers long, some 10-20 kilometers wide. Its tallest peak has 2747 meters.

Vegetation on the mountain includes crops up to around 1000 meters, forests up to 1700 meters, and above that lie high pastures which encompass around 550 square kilometers. This mountain is most known as the origin of the dog breed Šarplaninac which was bred on these pastures.

The Sara National Park is in the territory of the Autonomous Province of Kosovo and Metohija and it spreads on 38,000 hectares, on the nothern slopes of Sar Mountain. What this national boasts in particular are the endemic relict Macedonian pine and white-bark pine, as well as the Alpine rose. As for game, this is the habitat of the lynx, bear, chamois and other species.

A locality called "Gine voda" is special attraction because the white-bark pine, Macedonian pine, skotch pine, spruce, sycamore... are represented there all on a small area.

The Sara National Park abounds in streams and small rivers and it spreads in the municipalities of Urosevac, Suva Reka, Kacanik and Prizren.

See also List of mountains in Serbia and Montenegro