A77 or A-77 may refer to:
- Roads
- A77 motorway (France)
- A77 motorway (Netherlands)
- A77 road (Scotland)
- Autovía A-77, a Spanish motorway
- Studer-Revox A77, a 1967 model of audio tape recorder manufactured by the Studer company under the Revox tradename
- Other
- Sony Alpha 77, camera made by Sony
- Teriflunomide (A77 1726), the active metabolite of leflunomide
- Benoni Defense in the Encyclopaedia of Chess Openings