University Archives has files on student organizations which typically include event flyers, bylaws, membership rosters, and group brochures. They do not have finding aids. Here are a few that relate to women student organizations. 

• Associated Women Students
• Dolphin Show
• Gay and Lesbian Alliance
• Gay and Lesbian University Union Graduate Women United
• Greek Life - Sororities (many sororities have individual files)
• Jewish Women’s Coalition
• Lesbian and Bisexual Women’s Group
• May Week Circus
• Northwestern Women Against Rape NU Student Wives Club
• NUBIA
• Orchesis
• Pro-Choice Coalition
• Society of Women Engineers Women at NU
• WAA-MU
• Women's Abortion Action Coalition 
• Women in Communications
• Women in Film
• Women's Interhouse Council
• Women's Liberation Movement
• Women's Literary Society
• Women in Leadership Conference
• Women in Leadership
• Women at Northwestern
• Women Off Campus
• Women's Self-Government
• Women's League
• Women's Self-Government Association
• Women's Week
• Young Women's Christian Association (YWCA)

Collections

• Records of Northwestern University Black Wimmin in Action (NUBIA), 1990-2001 
• Records of Clara Lu "N" Em, 1923-2014
• Records of Northwestern University Dames Club, 1946-1977
• Records of Northwestern University Settlement Association, Scrapbooks, 1917-1984
• Records of the Office of Student Guidance and Counseling, 1909-1989
• Records of the Young Women's Christian Association (YWCA), Northwestern University Chapter, 1901-1962