空气喇叭，又称气喇叭、气笛、空气扬声器或风按，形状类似小喇叭，由压缩气体来发出声响，依产生动力的来源可区分成手按、高压瓶或压缩机或等型式。

手按式空气喇叭常用来作为田径比赛开始的信号，与使用火药的传统起步枪相较，安全性较高。由于用力大小会影响声量，所以并未全面普及。手按式空气喇叭由于音量大而且携带方便，也常被用来作为运动竞赛或集会游行的造势器材。在1980年代以前的**，游走于大街小巷的冰淇淋流动摊贩普遍使用它来作为招呼顾客的工具。

使用高压瓶或压缩机的空气喇叭音量更大，一般作为铁路机车、货车的安全警示设备；近年来亦有暴走族使用于机车上。

An air horn is a pneumatic device designed to create an extremely loud noise for signalling purposes. It usually consists of a source which produces compressed air, which passes into a horn through a reed or diaphragm. The stream of air causes the reed or diaphragm to vibrate, creating sound waves, and the horn amplifies the sound so it is louder. Air horns are widely employed as vehicle horns, installed on large semi-trailer trucks, fire trucks, trains, and some ambulances as a warning device, and on ships as a signalling device.