The John Brown Museum, also known as the John Brown State Historic Site and John Brown Cabin, is located in Osawatomie, Kansas. The site is operated by the Kansas Historical Society, and includes the log cabin of Reverend Samuel Adair and his wife, Florella, who was the half-sister of the abolitionist John Brown. Brown lived in the cabin during the twenty months he spent in Kansas and conducted many of his abolitionist activities from there.