Air brake may refer to:
- Air brake (aeronautics), a type of flight control system used on aircraft to reduce speed <!-- on this Dab page, it is proper to *omit* the otherwise important distinction between this device and the superficially similar spoilers !-->
- On ground vehicles, <small>(more formally, specified as)</small> compressed-air-actuated braking systems:
- Air brake (road vehicle), friction-mediated type of brake used on large road vehicles in place of hydraulic brakes
- Railway air brake (used on both locomotives, and on towed or pushed cars)