Evidence for the contribution of WASH to Nutrition outcomes, particularly reducing stunting, has been growing over the last 5 years. The WASH and Nutrition toolkit emerged from consultations with WASH and Nutrition professionals, both within and outside of UNICEF, to learn about their experiences and draw out the good practices on integrated WASH and Nutrition programming. This toolkit gives guidance and tools developed to target key bottlenecks and support UNICEF staff to implement synergized WASH and Nutrition programming. The toolkit has been designed for use in a variety of contexts and can be accessible to a multi-sectoral audience.