Jonsberg, Mountain summit in Zittau Mountains, Germany.

Jonsberg is a mountain summit reaching 652 meters in the Zittau Mountains of southeastern Saxony. The peak forms part of the Lusatian Highlands and displays the typical forested slopes and geological structure found throughout this mid-range mountain range.

The Jonsberg lies entirely within Saxony's Zittau Mountains, east of Jonsdorf and west of Oybin, and has no border or Cold War dividing line. The old trade road Leipaer Straße branches north at the mountain's southern end and skirts its eastern flank. The Zittau narrow-gauge railway to Jonsdorf runs along the western slope.

The hiking paths crossing this summit have long connected neighboring villages and remain central to local community life. People from surrounding settlements use these routes seasonally, maintaining centuries-old patterns of movement through the landscape.

Trailheads for the summit lie in Jonsdorf, Oybin and its Hain district. Between Hain and Jonsdorf, at the Stern junction where the old Leipaer Straße branches off, a car park serves as a starting point. In winter a groomed cross-country ski trail circles the mountain, and with good snow the old Leipaer Straße can be used as far as Olbersdorf.

The old trade road Leipaer Straße branches off the Hain–Jonsdorf road at the mountain's southern end and skirts the Jonsberg on its eastern side. In winter, when snow conditions allow, this historic route is groomed and can be used as a cross-country ski trail as far as Olbersdorf.