Serravalle is a municipality in the district of Blenio in the canton of Ticino in Switzerland.

[4] In the past, the main sources of income were crops, livestock and vineyards.

This income was supplemented by money sent back to the village by emigrants to other European countries.

In the settlement of Rongier, an ancient town on the Lukmanier road, a Roman coin hoard was found.

Above the village is also the remains of Casa dei pagani, a cave castle from the 11th–13th Centuries.

The current building, with St. Martin as the patron saint is from 1602 to 1603, but the bell tower is from the 13th Century.

In 2000 about one-third and one-half of the workers were employed in manufacturing and the services sectors, respectively.

Over the same time period the amount of forested land has increased by 519 ha (1,280 acres).

[8] The historical population is given in the following chart:[13] The Casa dei pagani (a cave castle) and the parish church of S. Martino with its ossuary and churchyard in Malvaglia and the Parish Church of S. Maria Assunta with Ossuary, the Oratory of S. Maria Bambina a Navone and the ruins of Serravalle Castle in Semione are listed as Swiss heritage site of national significance.

The villages of Rongie/Orino, Semione, Navone and the Val Malvaglia region are all listed on the Inventory of Swiss Heritage Sites.

Of these, a total of 118 people worked in 49 businesses in the primary economic sector.

[8] In 2015, the average cantonal, municipal and church tax rate in the municipality for a couple with two children making SFr 80,000 was 2.4% while the rate for a single person making SFr 150,000 was 16.1%, both of which are close to the average for the canton.

[17] In the 2015 federal election, the most popular party was the Ticino League with 23.5% of the vote.