Juš Kozak (26 June 1892 – 29 August 1964), also known under the pseudonym Jalanov, was a Slovenian writer, playwright, and editor.
He is best known for his autobiographic novels, such as Celica (The Cell) on his experience as a political prisoner, and Lesena žlica (The Wooden Spoon) on life during World War II.
He was born in a wealthy middle-class family in Ljubljana, Slovenia, then part of the Austro-Hungarian Empire, and baptized Josef Paul Kozak.
In 1914, Kozak was arrested by the Austrian police because of alleged collaboration with the radical pro-Yugoslav nationalist youth organization Preporod, which had ties with the militant Bosnian organization Young Bosnia, often considered to be terrorist.
As editor, he opened the journal to Marxist and Communist authors, who published their articles under pseudonyms.