Bustieḷḷu (Spanish: Bustiello) is one of 44 parishes (administrative divisions) in Tinéu, a municipality within the province and autonomous community of Asturias, in northern Spain.
Situated at 577m (1,893feet) above sea level, it has a population of 98 (INE 2007), and is 3.83km2 in size. The postal code is 33878.