Rohr is a former municipality in the district of Gösgen in the canton of Solothurn in Switzerland. On 1 January 2021 the former municipality of Rohr merged into Stüsslingen.

Gösgen District is one of the ten districts of the canton of Solothurn, Switzerland, situated to the northeast of the canton. Together with the Olten District, Gösgen forms the electoral district of Olten-Gösgen. It has a population of 24,793.