A100, A.100 or A-100 may refer to:
Technology
Transportation and military
- A-100 class, the colloquial name given to the introductory/orientation training class for incoming US Foreign Service Officers
- A-100 (multiple rocket launcher), a 10 tube multiple rocket launcher used by the People's Liberation Army of China
- A100 road (England), a part of the London Inner Ring Road
- A100 road (Malaysia), a road in Malaysia
- A-100 (rocket), the artillery for the Chinese A-100 multiple rocket launcher
- Aero A.100, a 1933 Czechoslovak biplane light bomber and reconnaissance aircraft
- Astra A-100, a 1990 Spanish double-action/single-action semi-automatic pistol
- Beriev A-100, an airborne early warning and control aircraft under development for the Russian Air Force
- Bundesautobahn 100, a road in Germany
- Dodge A100, a Dodge van