The name Avusy first appeared on June 20, 1302, during the division of lands between Mont-de-Sion, Salève, and the Rhône.
After the Treaty of Turin in 1754, Avusy remained Savoyard, and in 1816, it became part of Switzerland. Avusy merged with Laconnex and Soral to form a new commune, which split in 1848.
Today, Avusy has around ten farms, eight construction companies, shops, craftsmen, liberal professions, and a riding school.