Grünberg (German pronunciation: [ˈɡʁyːnbɛʁk] ⓘ) is a town in the district of Gießen, in Hessen, Germany.

In 1980, the town hosted the 20th Hessentag state festival.

Grünberg is situated 20 km (12 mi) east of Gießen.

To the north Grünberg borders the municipality Rabenau and the town Homberg (Ohm) (Vogelsbergkreis), to the east the municipality Mücke (Vogelsbergkreis), to the south the town Laubach and to the west the municipality Reiskirchen.

The town of Grünberg also consists of the nearby villages of Beltershain, Göbelnrod, Harbach, Klein-Eichen, Lardenbach, Lehnheim, Lumda, Queckborn, Reinhardshain, Stangenrod, Stockhausen, Weickartshain and Weitershain.