The Hawn’s Mill Massacre occurred on October 30, 1838, when a mob/militia unit from Livingston County, Missouri, attacked a Mormon settlement in eastern Caldwell County, Missouri, after the Battle of Crooked River. By far the bloodiest event in the 1838 Mormon War in Missouri, it has long been remembered by the members of the Latter Day Saint movement. While the spelling "Haun" is common when referring to the massacre or the mill where it occurred, the mill's owner used the spelling "Hawn" in legal documents.

Livingston County is a county located in the northwestern portion of the U.S. state of Missouri. As of the 2020 census, the population was 14,557. Its county seat is Chillicothe. The county was organized January 6, 1837, and named for U.S. Secretary of State Edward Livingston.