The Kent State shootings were the killings of four and wounding of nine other unarmed Kent State University students by the Ohio National Guard on May 4, 1970, in Kent, Ohio, 40 mi (64 km) south of Cleveland. The killings took place during a peace rally opposing the expanding involvement of the Vietnam War into Cambodia by United States military forces as well as protesting the National Guard presence on campus. The incident marked the first time that a student had been killed in an anti-war gathering in United States history.

The fatal shootings triggered immediate and massive outrage on campuses around the country. It increased participation in the student strike that began on May. Ultimately, more than 4 million students participated in organized walk-outs at hundreds of universities, colleges, and high schools. The shootings and the strike affected public opinion at an already socially contentious time over the role of the United States in the Vietnam War.