Mary Willcox Brown Glenn

Mary Willcox Brown Glenn (1869–1940) was an American social worker. She is known for her involvement with the Charity Organization Society of Baltimore and the Family Welfare Association of America.

Glenn née Brown was born in Baltimore, Maryland on December 14, 1869. She began her career in social reform work at the Henry Watson Children's Aid Society of Baltimore. At the turn of the century she worked for the Baltimore Charity Organization Society. Glenn (1858-1950) served as a director of the Russell Sage Foundation. The couple settled in New York City where she was director of the Russell Sage Foundation’s Charity Organization Department.