M100 or M-100 may refer to: M-100 (Michigan highway), a north–south state trunkline highway in the U.S. state of Michigan M100 (Cape Town), a metropolitan route near Cape Town, South Africa M-100 (rocket), a two-stage Soviet sounding rocket M-100 (explosive), a pyrotechnic device M100, the magnetoencephalographic equivalent to the N100 large, negative-going evoked potential measured by electroencephalography Messier 100, a grand design spiral galaxy Miles Student (M.100), a lightweight trainer aircraft Palm m100 series, a popular lower cost version of the Palm Pilot M100 (New York City bus), a New York City Bus route in Manhattan Effa M100, the Brazilian name for the Changhe Ideal automobile M100, the second version of the Jeep trailer M100 Elan, a model of the Lotus Elan automobile Mercedes-Benz M100 engine, a 6.3/6.9 liter SOHC V8 automobile engine TRS-80 Model 100, an early portable computer Canon EOS M100, an mirrorless camera from Canon Mitsubishi SpaceJet M100, a regional jet aircraft HKL Class M100, a metro train of Helsinki Metro M100 (Cape Town), a Metropolitan Route in Cape Town, South Africa In athletics: Masters athletics, an age group for athletes aged 35+