The Belgian Royal Decree Regarding the Placement on the Market of Substances Manufactured at the Nanoscale, a Report to the King, and the Opinion of the Council of State were published in the September 24, 2014, issue of the Official Gazette. Substances defined as nanomaterials, and mixtures containing them, must be registered by the Belgian Federal Public Service for Health, Food Chain Safety and the Environment if at least 100 grams of the substance or mixture is placed on the market during the year covered by the registration, and if the entity putting the substance on the market produced this substance or mixture, or puts it on the market for professional users only. Biocidal products, medicines, food and feed, food contact materials, and pigments are excluded from the scope of the Royal Decree. Nanomaterials subject to declaration requirements must be registered by January 1, 2016, if they are already on the market by this date. After January 1, 2016, all nanomaterials concerned must be registered before being placed on the market. Mixtures subject to declaration requirements must be registered by January 1, 2017, if they are already on the market by this date. After January 1, 2017, all mixtures concerned must be registered before being placed on the market.