Collao[1] is a parish (administrative division) in Siero, a municipality within the province and autonomous community of Asturias, in northern Spain. The parish is located on Highway AS-113.
It is 0.27 km2 (0.10 sq mi) in size, and is situated at an elevation of 230 m (750 ft) above sea level. The population is 488 (INE 2006). The postal code is 33518.
Collao and other nearby parishes, such as Lieres and Carbayín, are historically associated with Andalusian mining.