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 Samsung Galaxy A55 5G, a mobile phone 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 A bypass or substitute for the word ass

See also List of highways numbered 55