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Korean name
Hangul	윤보선
Hanja	尹潽善
Revised Romanization	Yun Boseon
McCune–Reischauer	Yun Posŏn
Pen name
Hangul	해위
Hanja	海葦
Revised Romanization	Haewi
McCune–Reischauer	Haewi

Yun Bo-seon
윤보선
尹潽善
	Yun Bo-seon; 윤보선; 尹潽善
	;
4th President of South Korea
	In office; August 13, 1960 – March 22, 1962
Preceded by	Syngman Rhee
Succeeded by	Park Chung-hee
Born	August 26, 1897; Asan, South Chungcheong, Chosun
Died	July 18, 1990 (aged 92);
Nationality	Korean
Political party	Democratic
Spouse(s)	Gong Deok-gwi
Religion	Presbyterianism

This is a Korean name; the family name is Yun.

Yun Bo-seon (August 26, 1897 – July 18, 1990) was the President of South Korea from 1960 to 1962.

Born in Asan, Chungcheongnam-do, Yun graduated with an M.A. from the University of Edinburgh in 1930. He entered politics after Japanese occupation ended in 1945, with Syngman Rhee being his mentor. In 1948, Yun was appointed by Rhee as mayor of Seoul. A year later, he was appointed as the Minister of Commerce and Industry. Soon, he started to disagree with Rhee's authoritarian policies. He then served as president of the Red Cross Society, before being elected to the National Assembly in 1954. A year later, he founded the opposition Democratic Party along with several others.

After Rhee's government was ousted by a student-led pro-democracy uprising, Yun was elected president on August 13, 1960. He was merely a figurehead, as South Korea had switched to a parliamentary system in response to the authoritarian excesses of Rhee's regime. After Park Chung Hee's coup in 1961, he stayed on briefly to provide legitimacy to the regime, but resigned on March 22, 1962. He opposed Park's authoritarian rule and ran for president twice in 1963 and 1967, losing each time. After receiving suspended sentences several times for anti-government activities, Yun retired from politics in 1980 and focused primarily on cultural activities until his death from diabetic conditions and high blood pressure in 1990. His descendants currently live in the United States.