The Civil Rights Act of 1964 (Pub.L. 88352, 78 Stat. 241, enacted July 2, 1964) is a landmark civil rights and labor law in the United States that outlaws discrimination based on race, color, religion, sex, and national origin. It prohibits unequal application of voter registration requirements, racial segregation in schools and public accommodations, and employment discrimination. The act "remains one of the most significant legislative achievements in American history".Initially, powers given to enforce the act were weak, but these were supplemented during later years. Congress asserted its authority to legislate under several different parts of the United States Constitution, principally its power to regulate interstate commerce under Article One (section 8), its duty to guarantee all citizens equal protection of the laws under the Fourteenth Amendment, and its duty to protect voting rights under the Fifteenth Amendment.

The legislation was proposed by President John F. Kennedy in June 1963, but it was opposed by filibuster in the Senate. After Kennedy was assassinated on November 22, 1963, President Lyndon B. Johnson pushed the bill forward. The United States House of Representatives passed the bill on February 10, 1964, and after a 54-day filibuster, it passed the United States Senate on June 19, 1964. The final vote was 290130 in the House of Representatives and 7327 in the Senate. After the House agreed to a subsequent Senate amendment, the Civil Rights Act of 1964 was signed into law by President Johnson at the White House on July 2, 1964.

A filibuster is a political procedure in which one or more members of a legislative body prolong debate on proposed legislation so as to delay or entirely prevent decision. It is sometimes referred to as "talking a bill to death" or "talking out a bill" and is characterized as a form of obstruction in a legislature or other decision-making body.