Mary Young Cheney Greeley (1811 or 1814 – 1872) was the wife of American newspaper editor Horace Greeley.They married in Warrenton, North Carolina, on July 5, 1836. Little is known of her early life. She was briefly a schoolteacher, and later an intermittent suffragette and spiritualist. She is reported to have been mentally unstable for much of her life.