KOA Corporation (KOA Corporation) is a Japanese electronic passive component supplier founded in 1940 in Tokyo, headquartered in Ina, Nagano Prefecture.

  KOA is one of the world's largest manufacturers of SMT resistors. Product information includes surface mount resistors, low resistance/power shunt resistors, lead type resistors, temperature sensors, inductors, fuses, varistors, LTCC circuit substrates, and customized hybrid ICs. Its products are mainly used in automobiles, industrial equipment, environment, energy conservation, various power circuits, AV/household appliances, telecommunications, and medical equipment.

  KOA has 3600 employees worldwide, with 1100 employees in Japan. Production and sales bases are located throughout Japan, China, Malaysia, the United States, Germany, and Singapore.