Asio is a genus of owls.

Asio or ASIO may also refer to:

asio (C++ library), a programming library for asynchronous I/O Audio Stream Input/Output, computer sound card driver protocol for low-latency digital audio Australian Security Intelligence Organisation "ASIO", a song by Redgum from Frontline "ASIO" a song by Benny Cristo

See also AZO (disambiguation) ACO (disambiguation)