Bo (Spanish: Boo ) is one of 18 parishes (administrative division) in Aller, a municipality within the province and autonomous community of Asturias, in northern Spain.

The altitude is between 420 m (1,380 ft) and 480 m (1,570 ft) above sea level. It is 6.9 km2 (2.7 sq mi) in size with a population of 359 as of January 1, 2024.

Villages and hamlets

  • Bo
  • Bustiyé
  • El Caliyu
  • La Cotá
  • Carrerayana
  • Pando
  • La Pena
  • La Pruvía
  • Rotella
  • La Terrona
  • Viaonga
  • Love