The Indiana Klan was a branch of the Ku Klux Klan, a secret society in the United States that organized in 1915 to promote ideas of racial superiority and affect public affairs on issues of Prohibition, education, political corruption, and morality. It was strongly white supremacist against African Americans, Chinese Americans, and also Catholics and Jews, whose faiths were commonly associated with Irish, Italian, Balkan, and Slavic immigrants and their descendants. In Indiana, the Klan did not tend to practice overt violence but used intimidation in certain cases, whereas nationally the organization practiced illegal acts against minority ethnic and religious groups.

The Ku Klux Klan, commonly shortened to the KKK or the Klan, is the name of several historical and current American white supremacist, far-right terrorist organizations and hate groups. According to historian Fergus Bordewich, the Klan was "the first organized terror movement in American history." Their primary targets, at various times and places, have been African Americans, Jews, and Catholics.