Synnyr (Russian: Сынныр) is a mountain massif in Irkutsk Oblast and Buryatia, Russian Federation. The range is part of the Baikal Rift Zone.

There is potash mining in the range at the Synnyr mine.

The Synnyr stretches from SW to NE for roughly 200 kilometres (120 mi) between the Akitkan Range and the Upper Angara Range, west of the northwestern end of the Stanovoy Highlands, with the Patom Highlands to the north. It is limited by the valleys of the Chaya and Mama rivers. The Chuya, Kholodnaya, Tyya and Olokit have their sources in the range.

The heights of the range summits decrease from 2,500 metres (8,200 ft) in the southwest to 1,300 metres (4,300 ft)in the northeast. The highest peak is 2,514 metres (8,248 ft) high Inyaptuk Golets, a ‘’golets’’-type of mountain with a bald peak.

The lower slopes of the range are mainly covered by larch taiga, with mountain tundra and bare rocky summits (golets) at higher elevations.

• Baikal Rift Zone
• List of mountains and hills of Russia