Rieḷḷu (in Asturian; Bable; Leonese; Asturleonese pronounced as /ˈrjet͡ʂu/) (Spanish:Riello) is one of thirteen parishes (administrative divisions) in Teverga, a municipality within the province and autonomous community of Asturias, in northern Spain.
Situated at 510m (1,670feet) above sea level, it is 5.89km2 in size, with a population of 129 (INE 2006). The postal code is 33111.