MKO may refer to: ISO 639:mko or Mingang Doso, a language of Nigeria Mojahedin-e-Khalq Organization, Iran Mauna Kea Observatories, Hawaii Münchener Kammerorchester, Munich chamber orchestra IATA code for Davis Field airport, Muskogee, Oklahoma Mary-Kate Olsen, American designer and businessperson Markona railway station, Odisha, India MKO Abiola (1937–1998), Nigerian businessperson Mechanical Keep Out, the clearance required around a PCBA to avoid mechanical fitment issues