김정은(金正恩, 1983년/1982년/1984년 1월 8일)은 조선민주주의인민공화국 원수 및 조선로동당 제1비서 및 조선민주주의인민공화국 국방위원회 제1위원장이다. 김정일 조선민주주의인민공화국 국방위원회 위원장과 후처 고영희 사이의 차남이다. 평양직할시 출신으로, 별칭은 '샛별 대장', '은하'이고, 가명은 '박운'이다. 김정일 사후, "당과 국가, 군대의 최고 령도자"로 칭해지고 있다. 2012년 4월 11일에 아버지 김정일을 세습해 당 1비서가 되었으며, 4월 12일에는 국방위원회 1위원장이되었다. 2012년 7월 18일 공화국 원수로 진급했다.
Kim Jong-un (born 8 January 1983)— also romanised as Kim Jong-eun, Kim Jong Un or Kim Jung-eun— is the supreme leader of North Korea, the son of Kim Jong-il (1941–2011) and the grandson of Kim Il-sung (1912–1994). He has held the titles of the First Secretary of the Workers' Party of Korea, the Chairman of the Central Military Commission, First Chairman of the National Defence Commission of North Korea, the Supreme Commander of the Korean People's Army, and also a presidium member of the Politburo of the Workers' Party of Korea. He was officially declared the supreme leader following the state funeral for his father on 28 December 2011. He is the third and youngest son of Kim Jong-il and his consort Ko Young-hee. From late 2010, Kim Jong-un was viewed as heir apparent to the leadership of the nation, and following his father's death, he was announced as the "Great Successor" by North Korean state television. At Kim Jong-il's memorial service, North Korean Chairman of the Supreme People's Assembly Kim Yong-nam declared that "Respected Comrade Kim Jong-un is our party, military and country's supreme leader who inherits great comrade Kim Jong-il's ideology, leadership, character, virtues, grit and courage". On 30 December 2011, the Politburo of the Workers' Party of Korea formally appointed Kim as the Supreme Commander of the Korean People's Army. On 11 April 2012, the 4th Party Conference elected him to the newly created post of First Secretary of the Workers' Party of Korea.
He was promoted to the rank of marshal of the DPRK in the Korean People's Army on 18 July 2012, consolidating his position as the supreme commander of the armed forces. He obtained two degrees, one in physics at Kim Il-sung University and another as an Army officer at the Kim Il-sung Military University. At 30 years of age, he is the world's youngest head of state.