Bliznyuk or Blyznyuk is a gender-neutral Slavic surname of Ukrainian origin (Близнюк). People with this name include:
Anastasia Bliznyuk (born 1994), Russian group rhythmic gymnast, Olympian Anatoliy Blyznyuk (born 1948), Ukrainian politician and former governor of the Donetsk Oblast Bogdan Bliznyuk (born 1995), Ukrainian basketball player Gennadi Bliznyuk (born 1980), Belarusian football player and coach Illya Blyznyuk (born 1973), Ukrainian football player and coach Valentin Bliznyuk (1928–2019), Russian aerospace engineer and aircraft designer