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A head-up display, or HUD, is any transparent display that presents data without requiring the user to look away from his or her usual viewpoint. The origin of the name stems from the user being able to view information with their head "up" and looking forward, instead of angled down looking at lower instruments.

Although they were initially developed for military aviation, HUDs are now used in commercial aircraft, automobiles, and other applications.

Head-up displays are becoming increasingly available in production cars, and usually offer speedometer, tachometer, and navigation system displays. BMW, Lexus, Citroën, GM, and Nissan currently offer some form of HUD system. Motorcycle helmet HUDs are also commercially available.

Add-on HUD systems also exist, projecting the display onto a glass combiner mounted on the windshield. These systems have been marketed to police agencies for use with in-vehicle computers.