Women play a vital role in water, sanitation and hygiene (WASH) interventions. This document, a collaboration between the Water Supply and Sanitation Collaborative Council (WSSCC) and the Water Engineering and Development Centre (WEDC), collects and analyzes noteworthy examples that demonstrate the widespread impacts of women's contributions to WASH activities. The evidence comes from literature, project reports, evaluations and some personal correspondence. The report is organised around selected key themes, but the multiple impacts of any single intervention or improvement where known are also indicated.