World Wide Opportunities on Organic Farms (WWOOF, or Willing Workers on Organic Farms) is a loose network of national organizations that facilitate placement of volunteers on organic farms. While there are WWOOF hosts in 99 countries around the world, no central list or organization encompasses all WWOOF hosts. As there is no single international WWOOF membership, all recognized WWOOF country organizations strive to maintain similar standards and work together to promote the aims of WWOOF.

WWOOF aims to provide volunteers with first-hand experience in organic and ecologically sound growing methods to help the organic movement and to let volunteers experience life in a rural setting or a different country. WWOOF volunteers (“WWOOFers”) generally do not receive financial payment. The host provides food, accommodation, and opportunities to learn in exchange for assistance with farming or gardening activities.

The duration of the visit can range from a few days to years. Workdays average five to six hours, and participants interact with WWOOFers from other countries. WWOOF farms include private gardens through smallholdings, allotments, and commercial farms. Farms become WWOOF hosts by enlisting with their national organization. In countries with no WWOOF organization, farms enlist with WWOOF Independents.