Dudnik or Dudnyk () is a gender-neutral Slavic surname. Notable people with the surname include:
Alexander Dudnik (1939–1996), Kazakhstani serial killer Andrei Dudnik (born 1981), Russian football player Ihor Dudnyk (born 1985), Ukrainian football defender Olesya Dudnik (born 1974), Ukrainian gymnastics coach and former artistic gymnast Yelena Dudnik (born 1978), Russian sport shooter Yuriy Dudnyk (born 1968), Ukrainian football coach and a former player Yurii Dudnyk (footballer, born 2002), Ukrainian football player