Share of people practicing open defecation in 2015[1]
Sanitation facilities coverage worldwide from 2000 to 2015 (the orange line is the data for open defecation).[2]

Open defecation is the human practice of defecating outside ("in the open") rather than into a toilet. People may choose fields, bushes, forests, ditches, streets, canals or other open space for defecation. They do so either because they do not have a toilet readily accessible or due to traditional cultural practices.[3] The practice is common where sanitation infrastructure and services are not available. Even if toilets are available, behavior change efforts may still be needed to promote the use of toilets. 'Open defecation free' (ODF) is a term used to describe communities that have shifted to using toilets instead of open defecation. This can happen, for example, after community-led total sanitation programs have been implemented.

Open defecation can pollute the environment and cause health problems. High levels of open defecation are linked to high child mortality, poor nutrition, poverty, and large disparities between rich and poor.[4](p11) Ending open defecation is an indicator being used to measure progress towards the Sustainable Development Goal Number 6. Extreme poverty and lack of sanitation are statistically linked. Therefore, eliminating open defecation is thought to be an important part of the effort to eliminate poverty.[5]

As of 2019 an estimated 673 million people practice open defecation,[6]:74 down from about 892 million people (12 percent of the global population) in 2016.[7] In that year, 76 percent (678 million) of the people practicing open defecation in the world lived in just seven countries.[7]