Kost or KOST may refer to:

  • KOST, a radio station (103.5 FM) licensed to Los Angeles, California, United States
  • KOST, original call letters for KILT-FM, Houston, Texas, United States
  • Kost Castle, a castle in Czech Republic
  • Kost, Minnesota, a community in the United States
  • Kost Human, South African rugby league player who represented his country in the 1995 World Cup
  • Kost Lavro (born 1961), Ukrainian artist and illustrator
  • Kost Levytsky (1859–1941), Ukrainian politician
  • Kostantyn Kost Novytsky (born 1950), Ukrainian musician
  • Kenny Kost (born 1979), American boxer
  • Maciej Kost, a Polish tennis player who debuted in the Davis Cup in 1994
  • Fräulein Kost, a character in the musical Cabaret and the 1972 film adaptation