The humanitarian sector has been strengthening its focus on and commitment to community-centred responses in recent years. This guide aims to provide field staff with clear, accessible guidance on the principles and practice of community engagement in WASH programmes. The content has been field tested in a variety of contexts. The principles and approaches described here are relevant in other programmes and sectors too, but the target audience for this guide is WASH staff in humanitarian programmes – especially those responsible for designing, implementing and monitoring public health promotion activities. It will also be relevant for managers, public health engineers and decision makers interested in promoting good quality outcomes in WASH programmes by ensuring that communities affected by crisis are at the centre of the response.