A55

A55 may refer to:

Roads

 * A55 highway (Australia), a road connecting St George, Queensland and Lithgow, New South Wales
 * A55 motorway (Canada), a road in Québec connecting Stanstead and Shawinigan
 * A55 motorway (France), a road connecting Marseille and Martigues
 * A55 road (Great Britain), a road connecting Chester and Holyhead
 * Autostrada A55 (Italy), a bypass around Turin
 * A55 road (Northern Ireland), a road around Belfast

Electronics

 * A-series light bulb of diameter 55 mm
 * a model of a Fusion Controller Hub (FCH), a chipset used for AMD microprocessors
 * Sony Alpha 55, a DSLT camera
 * Siemens A55, a mobile phone
 * ARM Cortex-A55, a processor microarchitecture

Other

 * Old Indian Defense, Encyclopaedia of Chess Openings code
 * Austin Cambridge A55, a British car
 * GER Class A55, a British steam locomotive