The emergency Water, Sanitation and Hygiene Promotion (WASH) gap analysis project was funded by The Humanitarian Innovation Fund (HIF), a program managed by Enhancing Learning and Research for Humanitarian Assistance (ELRHA) in partnership with the Active Learning Network for Accountability and Performance in Humanitarian Action (ALNAP), and is a component of a larger initiative to identify and support innovations in emergency WASH. This paper gives an explanation of the background, methodology, and findings of the program.