Sister Dorothy Marie Hennessey O.S.F. (March 24, 1913 – January 24, 2008) was a Roman Catholic Franciscan Sister and activist. Hennessey was born in Manchester, Iowa. The 13 Hennessey siblings — Dorothy Marie Hennessey was the eldest — grew up on an Iowa farm. She was 19 years older than her younger, natural sister, Sister Gwen Hennessey, who is also a religious Sister.