Caerano di San Marco, or simply Caerano, is a town with 7,813 inhabitants in the province of Treviso.

Diadora is an Italian sportswear and footwear manufacturing company based in Caerano di San Marco (Veneto), subsidiary of Geox, founded in 1948. Diadora produces football boots and athletic shoes, as well as a range of apparel that includes t-shirts, polo shirts, hoodies, jackets, leggings, shorts, and compression garments. Diadora also commercialises football balls in the US market. In 2020, Geox filed for bankruptcy in Canada.