Io

Automeris Io, the Io moth (or peacock moth), is a beautiful North American moth. Aglais Io (the European peacock), is a colourful butterfly found in Europe and temperate Asia. Previously classified as Inachis Io, and formerly classified as the only member of the genus Inachis, Aglais Io is now generally accepted as the scientific name (of the peacock butterfly), but the terms are synonymous. The name derives from Greek mythology, meaning Io, the daughter of Inachus. Within the twists and various endings to this tale, in one of which the large eyes of the cow, Io, became the eyes in the peacock's tail feathers.

85 Io is a main belt asteroid discovered by C.H.F. Peters on September 19, 1865, also named for Io of Greek mythology. With a two-digit number and a two-letter name, 85 Io has the shortest designation of all minor planets.

85 Io is a large main belt asteroid.