Standby may refer to:

• Standby (telecommunications), term in telecommunications
• Standby (air travel), a list in which passengers may request to be placed on to request an earlier or more convenient flight.
• Standby (theater), an actor or performer who will appear in a particular role if the regular performer is not present – similar to an understudy. However, unlike understudies, standbys will only perform when they are needed to cover a role, and do not regularly appear in a show.
• Standby (band), a funny music band from Greece, http://www.standbyband.gr.
• Sleep mode (in electronics), also known as standby-mode - a mode in which electronic appliances are turned off but under power and ready to activate on command
• Standby power energy consumed by an electronic device while it is turned off.
• Standby (computers), a mode an ACPI-compliant computer can be in. It is more formally called ACPI S3.
• Standby, the term NASA uses in air-to-ground radio communications for expressing "please wait"

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