Katherine MacGregor (January 12, 1925 – November 13, 2018) was an American actress best remembered for her sharp-tongued yet unforgettable portrayal of Harriet Oleson on the beloved television series Little House on the Prairie. With her impeccable comic timing and layered performance, MacGregor transformed the gossipy, status-obsessed mercantile owner into one of the show’s most iconic—and surprisingly human—characters, often delivering moral lessons through her clashes with the Ingalls family.