Audio may refer to:

• Audio signal, an electrical representation of sound
• Audio frequency, a frequency in the audio spectrum
• Digital audio, representation of sound in a form processed and/or stored by computers or other digital electronics
• Audio, audible content in media production and publishing
• Semantic audio, extraction of symbols or meaning from audio

An audio/video receiver (AVR) is a consumer electronics unit used in a home theater. Its primary purpose is to receive audio and video signals from a number of sources and process them to drive loudspeakers and a display. Possible displays include, television, monitor, or video projector while the inputs may come from, television, satellite receiver, radio, DVD players, Blu-ray Disc players, VCRs, and video game consoles. The AVR source signal and other settings, including volume, are normally set by a remote controller.

Audio/Visual is a greatest hits compilation released by Christian rock band Bleach. It was released in October 2005 by Tooth & Nail Records and includes two new songs, "Good to be Alive" and "Must Be Divine". Bleach's final show, performed on August 29, 2004 in Nashville, Tennessee, is included on a bonus DVD.

Uniregistry is a Cayman Islands-based domain name registry that administers the generic top-level domains .audio, .auto, .blackfriday, .car, .cars, .christmas, .click, .diet, .flowers, .game, .gift, .guitars, .help, .hiphop, .hiv, .hosting, .juegos, .link, .lol, .mom, .photo, .pics, .property, .sexy, and .tattoo. In February 2012, the related company Uniregistrar Corporation became an ICANN-accredited registrar and launched under the licensed Uniregistry brand name in 2014.