Mabel Antoinette Sine Wadsworth (October 14, 1910 – January 11, 2006)[1] was an American birth control activist and women's health educator.

While in nursing school, Wadsworth became acquainted with the work of American birth control activist Margaret Sanger.

[3] Coming to Bangor in 1946, she joined the Maternal Health League, a volunteer organization modeled on Sanger's work which stressed contraceptive education.

Rather than hire professionally trained counselors and outreach workers to staff the program, she chose women who could relate with clients because of their own personal experience.

[1] She also lobbied for the successful passage of a state bill that gave teenagers "confidential access to contraceptives and STI testing".

[6] In 1984 she supported the establishment and the naming of the Mabel Wadsworth Women's Health Center in Bangor, Maine in her honor.

[7] Wadsworth volunteered for organizations including the Eastern Maine General Hospital Auxiliary and the League of Women Voters.