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Park Chung Hee (Korean: 박정희; November 14, 1917 – October 26, 1979) was a South Korean politician and army officer who served as the 3rd President of South Korea from 1962 to 1979 after he seized power in the May 16 coup of 1961. He is regarded as one of the most consequential leaders in Korean history, although his legacy as a military dictator continues to cause controversy.

Before his presidency, Park was the second-highest-ranking officer in the South Korean army. His coup brought an end to the interim Second Republic of Korea. After serving for two years as chairman of the military junta, he was elected president in 1963, ushering in the Third Republic. Park began a series of economic reforms that eventually led to rapid economic growth and industrialization, a phenomenon that is now known as the Miracle on the Han River. This made South Korea one of the fastest growing economies of the 1960s and 1970s, albeit with costs to labor rights. This era also saw the formation of chaebols: family companies supported by the state similar to the Japanese zaibatsu. Examples of significant chaebols include Hyundai, LG, and Samsung.

Although popular during the 1960s, Park's popularity started to plateau by the 1970s, with closer than expected victories during the 1971 presidential election and the subsequent legislative elections. In 1972, Park declared martial law after carrying out a self-coup. He then introduced the highly authoritarian Yushin Constitution, ushering in the Fourth Republic. Now ruling as a dictator, he constantly repressed political opposition and dissent and completely controlled the military. He also had much control over the media and expressions of art. In 1979, Park was assassinated by his close friend Kim Jae-gyu, director of the KCIA, following the Busan–Masan Uprising. Whether the assassination was spontaneous or premeditated remains unclear to this day. Economic growth continued in spite of the 1979 coup d'état and considerable political turmoil in the wake of his assassination. The country eventually democratized with the June Democratic Struggle in 1987.

Park remains a controversial figure in modern South Korean political discourse and among the South Korean populace in general, making a detached evaluation of his tenure difficult. While some credit him for sustaining economic growth, which reshaped and modernized South Korea, others criticize his authoritarian way of ruling the country (especially after 1971) and for prioritizing economic growth and social order at the expense of civil liberties and human rights. A Gallup Korea poll in October 2021 showed Park, Kim Dae-jung (an old opponent of Park whom he tried to have executed), and Roh Moo-hyun as the most highly rated presidents of South Korean history in terms of leaving a positive legacy, especially among South Korean conservatives and the elderly. Park's eldest daughter Park Geun-hye later served as the 11th president of South Korea from 2013 until she was impeached and convicted of various corruption charges in 2017.