BMW R100, with variant models designated by T, S, CS, RS, RS Classic, RT, RT Classic, TIC, TC, R and GS is a BMW motorcycle series, using a two-cylinder four-stroke boxer engine of 980 cc capacity.

Model production began in 1976, with a premature shutdown and subsequent restart in 1985, and final completion of the series in 1996.

The R100RS was the first motorcycle manufactured in volume to be fitted as standard with a frame fixed full fairing, a feature pioneered by the Vincent Black Prince.

A 5-speed manual transmission, with an optional kickstarter for the early models, and shaft drive to the rear wheel completed the drivetrain.

In the 1980s for environmental and marketing reasons, BMW initiated a move to the water-cooled K75 and K100 models to remain competitive with the technical lead of the Japanese motorcycle industry.

This decision led to protests from customers and dealers, BMW restarted R100 production, but with modified lower output, and improved torque curve engines with 44 kW (60 hp).