Capolago is a village situated at the south-eastern extremity of Lake Lugano, in the Swiss canton of Ticino. Originally a municipality in its own right, Capolago is now a quarter of the municipality of Mendrisio, itself part of the district of Mendrisio.

Lake Lugano is a glacial lake which is situated on the border between southern Switzerland and northern Italy. The lake, named after the city of Lugano, is situated between Lake Como and Lago Maggiore. It was cited for the first time by Gregory of Tours in 590 with the name Ceresio, a name which is said to have derived from the Latin word cerasus, meaning cherry, and refers to the abundance of cherry trees which at one time adorned the shores of the lake. The lake appears in documents in 804 under the name Laco Luanasco.