The Ku Klux Klan bombed the 16th Street Baptist Church, an African-American church in Birmingham, Alabama, killing four girls and injuring at least 14 other people (memorial march pictured).

The Ku Klux Klan, commonly shortened to KKK or Klan, is an American Protestant-led Christian extremist, white supremacist, far-right hate group. It was founded in 1865 during Reconstruction in the devastated South. Various historians have characterized the Klan as America's first terrorist group. The group contains several organizations structured as a secret society, which have frequently resorted to terrorism, violence and acts of intimidation to impose their criteria and oppress their victims, most notably African Americans, Jews, and Catholics. A leader of one of these organizations is called a grand wizard, and there have been three distinct iterations with various other targets relative to time and place.

The 16th Street Baptist Church bombing was a terrorist bombing of the 16th Street Baptist Church in Birmingham, Alabama, on September 15, 1963. The bombing was committed by a white supremacist terrorist group. Four members of a local Ku Klux Klan (KKK) chapter planted 19 sticks of dynamite attached to a timing device beneath the steps located on the east side of the church.

The 16th Street Baptist Church is a Baptist church in Birmingham, Alabama, United States. In 1963, the church was bombed by Ku Klux Klan members. The bombing killed four young girls in the midst of the Civil Rights Movement. The church is still in operation and is a central landmark in the Birmingham Civil Rights District. It was designated as a National Historic Landmark in 2006. Since 2008, it has also been on the UNESCO list of tentative World Heritage Sites.

Birmingham is a city in the north central region of Alabama, United States. It is the second-most populous city in the state with a population of 200,733 at the 2020 census and estimated at 196,357 in 2024, while the Birmingham metropolitan area with over 1.19 million residents is the largest metropolitan area in Alabama and 47th-most populous in the US. Birmingham serves as a major regional economic, medical, and educational hub of the Deep South, Piedmont, and Appalachian regions. It is the county seat of Jefferson County.