Iosif Grigor'evich Alliluyev (Russian: Ио́сиф Григо́рьевич Аллилу́ев; 22 May 1945 – 2 November 2008) was a Russian cardiologist and a grandson of Joseph Stalin.

The son of Stalin's daughter Svetlana Alliluyeva, Iosif was seven-years-old when Stalin, his mother's father and his famous grandfather, died in March 1953. Although he kept a low profile, he did take part in a television interview on Russian Channel One. He spoke about his relationship with his mother and how she fled to the United States.

Alliluyev died on 2 November 2008.

He is portrayed briefly as a 6-year-old in HBO's 1992 film Stalin.