Rogaška Slatina is a town in eastern Slovenia. It is the largest settlement and the seat of the Municipality of Rogaška Slatina. It is known for its curative mineral water, spa, and crystal glass.

Rogaška Slatina is a synonym for health-resort tourism in Slovenia. For centuries the curative mineral water rich in magnesium (branded as Donat Mg), the picturesque countryside, and other local attractions have attracted visitors to the area. Roman inscriptions referring to the spa waters have been found. A wooden fence was built around the spring in the 17th century, and the water flowed through a wooden trough. The castle lord Peter de Curti built an inn at the site in 1676 and charged people to visit the springs. At that time the water was also bottled in bottles produced by a nearby glass works.