Mary MacLane (May 1, 1881 – c. August 6, 1929) was a controversial Canadian-born American writer whose frank memoirs helped usher in the confessional style of autobiographical writing. MacLane was known as the "Wild Woman of Butte".

MacLane was a very popular author for her time, scandalizing the populace with her shocking bestselling first memoir and to a lesser extent her two following books. She was considered wild and uncontrolled, a reputation she nurtured, and was openly bisexual as well as a vocal feminist. In her writings, she compared herself to another frank young memoirist, Marie Bashkirtseff, who died a few years after MacLane was born, and H. L. Mencken called her "the Butte Bashkirtseff."