Statue of Mary Dyer in front of the State House.

Mary Barrett Dyer (c. 1611 — June 1, 1660) was an English Puritan turned Quaker who was hanged in Boston, Massachusetts Bay Colony (now in present-day Massachusetts), for repeatedly defying a Puritan law banning Quakers from the colony. She is one of the four executed Quakers known as the Boston martyrs.

A bronze statue of her by Quaker sculptor Sylvia Shaw Judson stands in front of the Massachusetts State House in Boston; a copy stands in front of the Friends Center in downtown Philadelphia, Pennsylvania, and another in front of Stout Meetinghouse at Earlham College in Richmond, Indiana.

Photo 447, April 2012