阿罗萨是瑞士的城镇，位于该国东部，由格劳宾登州负责管辖，面积154.8平方公里，海拔高度1,775米，2011年人口3,353，人口密度为每平方公里79人。

Arosa is a town and a municipality in the district of Plessur in the canton of Graubünden in Switzerland. It is both a summer and a winter tourist resort.

On 1 January 2013, the former municipalities of Calfreisen, Castiel, Langwies, Lüen, Molinis, Peist and St. Peter-Pagig merged into the municipality of Arosa.