RKI may refer to:
ISO 693-3 language code for the Arakanese language NIAI RK-I, a two-seat cabin aircraft designed and built in the USSR in 1938 Rabkrin, the People's Commissariat of Worker-Peasant Inspection in the Soviet Union Robert Koch Institute, a German federal government agency and research institute Rokot Airport, Mentawai Islands, West Sumatra, by IATA code