Sant'Antonio is a former municipality in the district of Bellinzona in the canton of Ticino in Switzerland.

A grave from the Early Iron Age (750-400 BC) has been discovered in the village.

The so-called Squadra or part of the village made up the medieval municipality of Vallemorobbia.

In 1464, iron ore mining began in Carena, which was operated with varying success and various owners until 1831.

[2] Sant'Antonio has an area, as of 1997[update], of 33.58 square kilometers (12.97 sq mi).

Out of the forested land, 55.7% of the total land area is heavily forested, while 22.1% is covered in small trees and shrubbery and 1.6% is covered with orchards or small clusters of trees.

[3] The municipality is located in the Bellinzona district on the heights above the right side of the upper Morobbia valley.

The blazon of the municipal coat of arms is Per pale Azure St. Anthony statant clead as a Monk haloed Or holding a staff and a book argent and behind him a Pig proper and Gules a Snake Argent.

Most of the population (as of 2000[update]) speaks Italian(76.8%), with German being second most common (20.8%) and Romansh being third ( 0.6%).

[6] The age distribution, as of 2009[update], in Sant'Antonio is; 11 children or 5.4% of the population are between 0 and 9 years old and 22 teenagers or 10.8% are between 10 and 19.

[7] The historical population is given in the following table:[2] The ancient mine at A Carena is listed as a Swiss heritage site of national significance.

[12] In the 2007 federal election the most popular party was the FDP which received 49.63% of the vote.

In the federal election, a total of 69 votes were cast, and the voter turnout was 40.4%.

[13] In the 2007[update] Gran Consiglio election, there were a total of 165 registered voters in Sant'Antonio, of which 110 or 66.7% voted.

[7] There were 61 residents of the municipality who were employed in some capacity, of which females made up 42.6% of the workforce.

[16] From the 2000 census[update], 127 or 75.6% were Roman Catholic, while 13 or 7.7% belonged to the Swiss Reformed Church.

In the lower secondary school system, students either attend a two-year middle school followed by a two-year pre-apprenticeship or they attend a four-year program to prepare for higher education.