This rapid review has found that there are many gaps in the evidence on humanitarian responses to acute watery diarrhoea (AWD) in Ethiopia, specifically in terms of necessary cross district and/or cross border co-ordination, as well as the human and financial resources needed for such aid (Fisseha, 2016; Oxfam GB, 2017; UNICEF, 2017a; OCHA Somalia, 2018). This is important in multi-sectorial aid programmes – which the majority of humanitarian responses are reported to be.