Ferdo Kozak (28 October 1894 – 8 December 1957) was a Slovenian author, playwright, editor and politician. He was born as Ferdinand Kozak in an upper middle class family in Ljubljana, then part of the Austro-Hungarian Empire. His older brother Juš Kozak also became an author and literary critic, while his younger brother became a Communist politician. Kozak died in Ljubljana. His son Primož Kozak was also a renowned playwright and essayist.