RLK
RLK stands for:
- Bayannur Tianjitai Airport (IATA code), Bayan Nur Airport , Inner Mongolia, People's Republic of China
- Air Nelson (ICAO code), New Zealand airline
- Reichs-Limeskommission (1890–1937), German archaeological institution
- Ruhr-Lippe-Kleinbahnen , forerunner of the AG Ruhr-Lippe-Eisenbahnen
