FKS may refer to:
Sport FK Sarajevo, a Bosnian football club FK Smederevo, a Serbian football club Formula Kart Stars, a British karting championship
Transport ICAO code: Focus Air Cargo (2004–2008), an American airline FAA LID: Frankfort Dow Memorial Field (used informally since at least 1937), an airport in Michigan, United States IATA code: Fukushima Airport (opened 1993), in Japan