Hrivňák (and its variants Hrivnák and Hrivnak) is a surname. Notable people with the surname include:
Gary Hrivnak (born 1951), American football player Jim Hrivnak (born 1968), Canadian ice hockey player Jozef Hrivňák (born 1973), Slovak football player Lucia Hrivnák Klocová (born 1983), Slovak athlete Michal Hrivňák (born 1991), Slovak football player Pavol Hrivnák (1931–1995), Slovak politician Peter Hrivňák (born 1965), Slovak boxer Vladimír Hrivnák (1945–2014), Slovak football player