Kim Jong-il (also written as Kim Jong Il, Korean: 김정일, Hanja: 金正日; born 16 February 1941; official biographies state 16 February 1942) is the Supreme Leader of the Democratic People's Republic of Korea (also known as North Korea). He is the Chairman of the National Defense Commission, Supreme Commander of the Korean People's Army, and General Secretary of the Workers' Party of Korea (the ruling party since 1948). He succeeded his father Kim Il-sung, founder of North Korea, who died in 1994, and commands the fourth largest standing army in the world. North Korea officially refers to him as the "Dear Leader" and the "Great Leader".

Soviet records show that Kim Jong-il was born in the village of Vyatskoye, near Khabarovsk, in 1941, where his father, Kim Il-sung, commanded the 1st Battalion of the Soviet 88th Brigade, made up of Chinese and Korean exiles. Kim Jong-il's mother, Kim Jong-suk, was Kim Il-sung's first wife. During his youth in the Soviet Union, Kim Jong-il was known as Yuri Irsenovich Kim (Юрий Ирсенович Ким), taking his patronymic from his father's Russified name, Ir-sen.

In 1945, Kim was three or four years old (depending on his birth year) when World War II ended and Korea regained independence from Japan. His father returned to Pyongyang that September, and in late November Kim returned to Korea via a Soviet ship, landing at Sonbong (선봉군, also Unggi). The family moved into a former Japanese officer's mansion in Pyongyang, with a garden and pool. Kim Jong-il's brother, "Shura" Kim (the first Kim Jong-il, but known by his Russian nickname), drowned there in 1948. Unconfirmed reports suggest that 5 year old Kim Jong-il might have caused the accident. In 1949, his mother died in childbirth. Again unconfirmed reports suggest that his mother might have been shot and left to bleed to death.