Helen Du Maresque Pigeon (January 28, 1889 – September 26, 1945) was an American social worker involved in law enforcement and criminal justice.

[4] Pigeon worked for the United States Commission on Training Camp Activities,[5] and the American Red Cross.

After World War I, she headed the Girls' Welfare Society of Worcester, and worked as a probation officer.

[11] Emphasizing the value of prevention and intervention,[12] she wrote in 1927 that "the proper diagnosis, advice based on scientific knowledge, or reference to a social agency for protection at a crucial moment may mean the difference between the sunlight of freedom or the shadow of high walls.

[4][14][15] She testified before a 1926 Senate hearing, on law enforcement in Washington, D.C.[16] During World War II, she worked on juvenile delinquency prevention, recommending comprehensive daycare, protective police services, and interagency collaboration to improve children's lives.