Birth date: January 8 (Widely believed to be in his early 30s, though birth year is publicly unavailable.)
Father: Kim Jong Il
Mother: Ko Young Hee
Marriage: Ri Sol Ju
Education: Kim Il Sung Military Academy, 2002-2007
April 2009 - Named to North Korea's National Defense Commission.
September 28, 2010 - Promoted to four-star general and named vice chairman of the Central Military Commission as well as to the Central Committee of the Workers' Party of Korea.
October 9, 2010 - Kim Jong Nam, eldest son of Kim Jong Il, tells Japan's TV Asahi that he opposes the hereditary transfer of power for a third generation. These are his first comments since the promotion of Kim Jong Un, his half-brother.
December 17, 2011 - North Korean leader Kim Jong Il dies at the age of 69.
December 28, 2011 - Accompanies the body of Kim Jong Il during the funeral procession through Pyongyang.
December 31, 2011 - Assumes command of the North Korean army. State-run Korean Central News Agency reports that the power was transferred to him on October 8 at the behest of his father.
April 15, 2012 - Speaks before hundreds of troops and others in Pyongyang as part of a celebration marking 100 years since the birth of the nation's founder, his grandfather. Kim's address is his first televised speech since assuming the country's leadership.
June 6, 2012 - Makes his second public speech, speaking to tens of thousands of children in Pyongyang on the 66th anniversary of the Korean Children's Union. His father, Kim Jong Il, is believed to have made only one brief broadcast throughout his reign.
July 18, 2012 - Kim Jong Un is given the title marshal of the army. It is the latest in a string of moves to reconfigure the top ranks of North Korea's military. The announcement follows the removal of the army chief, Ri Yong Ho.
September 8, 2013 - Upon returning from his second trip to North Korea, Dennis Rodman says he held "baby Ju Ae" and describes Kim Jong Un as "a good dad."
January 8, 2014 - Dennis Rodman sings "Happy Birthday" to Kim Jong Un before he and other former NBA players take on the North Koreans in an exhibition game.
March 9, 2014 - Kim is unanimously elected as Deputy to the Supreme People's Assembly (SPA) of the DPRK, with 100% turnout.
July 2015 - South Korean Foreign Minister Yun Byung-se says that Kim has executed 70 officials since coming to power in late 2011.
December 10, 2015 - According to state media outlet KCNA, Kim claims North Korea has added the hydrogen bomb to its nuclear arsenal. But outside observers are skeptical, saying that such an advance in nuclear technology seems unlikely.