The Elementary and Secondary Education Act (ESEA) was passed by the 89th United States Congress and signed into law by President Lyndon B. Johnson on April 11, 1965. Part of Johnson's "War on Poverty", the act has been one of the most far-reaching pieces of federal legislation affecting education ever passed by the United States Congress, and was further emphasized by the revised No Child Left Behind Act of 2001.

The 89th United States Congress was a meeting of the legislative branch of the United States federal government, composed of the United States Senate and the United States House of Representatives. It met in Washington, D.C., from January 3, 1965, to January 3, 1967, during the second and third years of Lyndon B. Johnson's presidency. The apportionment of seats in the House of Representatives was based on the 1960 United States census.