Keihin is a Japanese automotive and motorcycle parts brand of Astemo. At the past times, Keihin was a major supplier to Honda, who owned nearly half of Keihin's shares, but also supplies other motorcycle manufacturers, among them Triumph, Suzuki, Kawasaki, KTM, Royal Enfield, and Harley-Davidson. In addition to carburetors, Keihin supplies the automotive industry with engine, transmission, and climate control products, including intake manifold assemblies, HVAC assemblies, compressors, valves, solenoids, and engine control units.

Keihin was founded in 1956 and began U.S. manufacturing in 1989. Counting all U.S. locations, Keihin has more than 20,000 employees. Keihin North America's corporate headquarters is in Anderson, Indiana.