Slobodan Princip (Serbian Cyrillic: Слободан Принцип; 25 May 1914–May 1942), nicknamed Seljo (Сељо), was a Yugoslav Partisan fighter and the district staff chief of Partisan Sarajevo Oblast during World War II. He was posthumously awarded the Hero of Yugoslavia. He was the nephew of Gavrilo Princip.
Princip was born in Hadžići, near Sarajevo, Austria-Hungary (now Bosnia and Herzegovina), into an ethnic Serb family. His father Jovan (Jovo) was the brother of Gavrilo Princip, the assassin of Archduke Franz Ferdinand of Austria. He joined the Communist Youth (SKOJ) during his gymnasium years in Sarajevo.
The Partisan and Chetnik forces captured Rogatica on 24 October 1941, during the Siege of Rogatica. The final assault of the Partisan forces was carried out under the direct command of Partisan HQ member Seljo, including a detachment commanded by Slaviša Vajner "Čiča", when Partisans used Molotov cocktails to attack the town garrison. He got typhoid fever during Operation Trio and died in Šćepan Polje in May 1942. He was buried at the Cemetery of National Heroes on Trebević near Sarajevo.
He was posthumously awarded the Hero of Yugoslavia on 7 November 1942. The acclaimed student cultural club (AKUD) "Slobodan Princip – Seljo" was named after him. A number of schools in Bosnia and Belgrade have been named after him as well.