This brochure is published within the framework of the Scheme for the Application of International Standards for Fruit and Vegetables established by OECD in 1962. It comprises explanatory notes and illustrations to facilitate the common interpretation of the onions standard in force. This updated brochure illustrates the revised standard text (2012), new marketing practices and development in production. It illustrates the quality parameters on high quality photographs.Thus it is a valuable tool for inspection authorities, professional bodies and traders interested in the international trade in onions.