Mach may refer to:
- Mach number, a measure of speed
- Gillette Mach3, a manual razor with three blades
- Mach bands, an optical illusion
- Mach Five, the name of the car in the animated TV series Speed Racer
- Muscarinic acetylcholine receptor, abbreviated mACh
In Computers:
- ATI Mach, a 2D GPU chip by ATI
- GNU Mach, the microkernel upon which GNU Hurd is based
- Mach-II, an object-oriented MVC framework for CFML and PHP
- Mach (kernel), an operating systems kernel technology used, for example, in Mac OS X
In Entertainment:
- M.A.C.H., a flight combat video game for the PlayStation Portable
- Mach 3, a video game developed and published by Loriciels
- Mach Rider a futuristic driving video game
People:
- David Mach, a Scottish artist
- Ernst Mach, a Bohemian-Austrian physicist and philosopher
Places:
- Machynlleth, a town in Powys, Wales
- Mach, Balochistan, a town in Pakistan
