Janko Gredelj (28 March 1916 – 23 December 1941) was a Yugoslav communist and one of the organizers of the antifascist struggle in Zagreb in 1941. He was born in Zagreb in 1916. After finishing public school, he went on railway school. He also got the job there. In 1937, he became a member of the Young Communist League of Yugoslavia, and the next year a member of the Communist Party of Yugoslavia. After invasion of Yugoslavia by Axis powers in 1941, he was one of the organizers of the shock groups at the railway in Zagreb. He participated in a few diversions: attack at the Gestapo agents in Bukovačka street and theft of 60 rifles, 10,000 bullets and some hand grenades from Germans' wagons at the West railway station in Zagreb.