Jánský (less commonly spelled Janský) is a Czech-language surname. Notable people with the surname include:

  • Peter Jánský (born 1985), Czech hockey player
  • Jan Janský (1873–1921), Czech serologist, neurologist and psychiatrist, credited with the first classification of blood into the 4 types
  • Markéta Jánská (born 1981), Czech model
  • Karl Guthe Jansky (1905–1950), American physicist, radio engineer and discoverer of radio waves emanating from the Milky Way

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