Ann Margaret O'Hara, SP, (born 22 December 1937) is a former Superior general of the Sisters of Providence of Saint Mary-of-the-Woods, Indiana, from 2001 to 2006.

O'Hara and her administration founded Providence Cristo Rey High School in Indianapolis as a sponsored ministry of the congregation.

She also oversaw the conversion of physical plant equipment at Saint Mary-of-the-Woods to use alternative fuels including biodiesel.

Prior to her term, she spent many years as dean of students at Immaculata College in Washington, DC.

She has held numerous leadership roles, including Executive Secretary of St. Gabriel Province, Saint Mary-of-the-Woods College Dean of Admission and Vice President of Student Affairs, and Director of Program Services for the National Association of Church Personnel Administration.