The report said victims were raped because of their political activities or the activities of their husbands on behalf of opponents of President Robert Mugabe, Zimbabwe's independent news agency ZimOnline reported Tuesday.
"The sexual assaults reported by this sample are ruthless, with horrific reports of gang rape. Some of the women were raped by numerous perpetrators until they lost consciousness," the report said.
The three groups involved in the report were the Research and Advocacy Unit of Harare, Zimbabwe Association of Doctors for Human Rights and the self-help organization Doors of Hope Development.
Their report calls for a government-led "multi-sectoral investigation" into the rapes.
It was based on 27 sworn affidavits and medical examinations of women.
Members of the Zimbabwe National Army were implicated in eight of the cases.