Gender equality, serving the most vulnerable, and addressing the particular needs of women and girls are among the core principles of the Global Sanitation Fund (GSF). Since its launch in 2008 by the Water Supply and Sanitation Collaborative Council (WSSCC), the GSF has been committed to these principles in the sanitation and hygiene behaviour change programmes it supports. However, challenges have been identified in sufficiently addressing these principles, such as disaggregating data by gender to assess progress.