Syngman Rhee or Yi Seungman (Hangul: 이승만; Hanja: 李承晩; Korean pronunciation: [i sɯŋman]; March 26, 1875 – July 19, 1965) was the first president of South Korea. His presidency, from August 1948 to April 1960, remains controversial, affected by Cold War tensions on the Korean peninsula and elsewhere.

Rhee was regarded as an anti-Communist and a strongman, and he led South Korea through the Korean War. His presidency ended in resignation following popular protests against a disputed election. He died in exile in Hawaii.

Syngman Rhee was born on March 26, 1875 into a rural family of modest means in Hwanghae Province, Korea. Rhee was the youngest of five siblings, though his elder brothers died prematurely. Rhee's family traced its lineage back to the third king of the Chosŏn Dynasty. When Rhee was two years old, the family moved to Seoul. His early education involved primarily classic Chinese literature; though he attempted civil service examinations, he failed them multiple times. When reforms abolished traditional systems of education, Rhee enrolled in Paejae School, an institution which had been established by a missionary from the United States. Rhee learned English and began a school newspaper, Maeil Sinmun.

The Korean War (Korean: 한국전쟁 or 조선전쟁, Hanja: 韓國戰爭 or 朝鮮戰爭; 25 June 1950 – 27 July 1953) was a war between the Republic of Korea (supported primarily by the United States of America, with contributions from allied nations under the aegis of the United Nations) and the Democratic People's Republic of Korea (supported by the People's Republic of China, with military and material aid from the Union of Soviet Socialist Republics). The Korean War was primarily the result of the political division of Korea by an agreement of the victorious Allies at the conclusion of the Pacific War at the end of World War II. The Korean Peninsula was ruled by the Empire of Japan from 1910 until the end of World War II. Following the surrender of the Empire of Japan in September 1945, American administrators divided the peninsula along the 38th parallel, with U.S. military forces occupying the southern half and Soviet military forces occupying the northern half.