Kozak is a Slavic surname literally meaning Cossack. Notable people with the surname include:
Amanda Kozak (born 1984), American beauty pageant winner
Anna Kozak (born 1974), Belarusian sprinter
Andrew Kozak (born 1982), meteorologist and television personality
Ashley Kozak, British jazz bassist, record producer and artists' manager
Danuta Kozák (born 1987), Hungarian sprint canoer
Dmitry Kozak (born 1958), Russian politician
Don Kozak (born 1952), Canadian former professional ice hockey forward
Evelyn Kozak (1899-2013), American supercentenarian who died at the age of 113 years, 301 days and was the oldest Jew ever
Ferdo Kozak (1894-1957), Slovenian author, playwright, editor and politician
Harley Jane Kozak (born 1957), American actress and author
Heidi Kozak (born 1963), American actress
Ivan Kozák (born 1970), Slovak football player
Ján Kozák (footballer born 1954), Slovak footballer
Ján Kozák (footballer born 1980), Slovak footballer
Juš Kozak (1892-1964), Slovenian writer, playwright and editor
Les Kozak (born 1940), Canadian former ice hockey player
Libor Kozák (born 1989), Czech football player
Mykhaylo Kozak (born 1991), Ukrainian football striker
Oleksandr Kozak (born 1994), Ukrainian footballer
Petr Kozák (born 1965), Czech orienteering competitor
Petro Kozak (1911–1984), Ukrainian clandestine Greek-Catholic hierarch, auxiliary bishop of Lviv (1983–1984)
Primož Kozak (1929-1981), Slovenian playwright and essayist
Rachael Kozak, Female electronic musician and Black Metal lyricist
Richard Kozak (born 1949), Canadian politician in Manitoba, Canada
Roman Mykolayovych Kozak (born 1957), Ukrainian politician, candidate in the 2004 Ukrainian presidential election
Roman Yefimovich Kozak (1957-2010), Russian theatre actor and director
Semyon Kozak (1902-1953), Soviet general
Scott Kozak (born 1965), American football linebacker
Syarhey Kozak (born 1981), Belarusian footballer
Václav Kozák (1937-2004), Czech rower
Warren Kozak (born 1951), American writer, journalist
Zbigniew Kozak (born 1961), Polish politician
