M46
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M46 may refer to:
- Messier Object 46, a rich star cluster discovered in 1771
- The M46 'Patton' tank (circa 1949)
- A hypothetical new Motorway between the M1 and the M5 in the United Kingdom, roughly following the line of the A46
- A four-speed gearbox (transmission) with electric overdrive from Volvo, used in new cars from 1975 through 1991. Gear ratios were: 4.03:1, 2.16:1, 1.37:1, 1.00:1, 0.79:1 (overdrive).