Arosa is a statistic town and a municipality in the Plessur Region 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.
At the end of 2013 the Arosa ski resort was linked with Lenzerheide by cable-car, creating the new ski resort of Arosa Lenzerheide. Since then transport passes work in both resorts.
The official language of Arosa is (the Swiss variety of Standard) German, but the main spoken language is the local variant of the Alemannic Swiss German dialect.
The resort is known throughout Switzerland for its famous ice hockey team, the EHC Arosa which used to be one of the most successful teams in the country.