The following lists events that happened during 1955 in South Vietnam.
Events February February 12 - United States President Dwight D. Eisenhower sends the first U.S. advisors to South Vietnam.
October October 26 - Ngô Đình Diệm proclaims Vietnam to be a republic with himself as its President (following the State of Vietnam referendum on October 23) and forms the Army of the Republic of Vietnam.
November November 1 - The Vietnam War begins between the South Vietnam Army and the North Vietnam Army in which the latter is allied with the Viet Cong.
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