The Washington Group is a United Nations Statistics Commission City Group formed of representatives of national statistical offices working on developing methods to better improve statistics on persons with disabilities globally, with input from various international agencies and experts. These include UN agencies, bilateral aid agencies, NGOs, Disabled People Organizations, and researchers.

The United National Statistical Commission authorized the formation of the Washington Group (WG) on Disability Statistics to address issues identified at the International Seminar on Measurement of Disability in New York in June 2001. The consensus of that seminar was the recognition that statistical and methodological work was needed at an international level in order to facilitate the comparison of data on disability cross-nationally.

The WG meets annually to address these issues and has established a number of working groups to continue developing and testing of WG tools between meetings. The WG has developed and tested a number of measurement tools that have been adopted by many countries and international agencies. The most well known tool is the WG Short Set of Six Questions that can be used to identify the population of persons with disabilities for, among other purposes, disaggregating outcome indicators such as these found in the Sustainable Development Goals (SDGs) by disability status.

The WG, like all City Groups, invites representatives from all national statistical agencies to come together to address selected problems in statistical methods, in this case issues pertaining to disability.

Currently membership in the WG includes over 135 countries and several international organisations and Disabled People Organizations.