Kostick, Kostik or Kostyk (Cyrillic: Костик) is the surname of the following notable people: Conor Kostick (born 1964), British historian and writer David Kostyk, a character in the fantasy novels Grishaverse Gavin Kostick, Irish playwright Ken Kostick (1953–2011), Canadian chef and television and radio personality Orest Kostyk (born 1999), Ukrainian footballer goalkeeper