Water allocation, which is the allocation over time of water resources between and within different sectors and for different uses, is one of the biggest challenges in water management and protection. Increasing demands on water from different sectors, growing water scarcity and climate variability have led to a rising global interest to the topic of water allocation. The global workshop on water allocation in transboundary basins will be organized in the Palais des Nations in Geneva on 16 and 17 October 2017. It will be followed by the fifth meeting of the Task Force on the Water-Food-Energy-Ecosystems Nexus (18 October 2017). The overarching objective of the workshop is to support efforts to develop sustainable and equitable transboundary arrangements on water allocation that strike a balance between robustness and flexibility. To this end, the workshop aims to increase understanding and knowledge of criteria, mechanisms, tools and good practices for water allocation in transboundary basins and aquifers. The programme will highlight opportunities in water allocation but also limitations, stressing the need to complement it with other approaches such as sharing benefits from water resources, increasing water use efficiency and managing demands to satisfy multiple water needs. The workshop is organized in cooperation with the Global Environment Facility’s project International Waters Learning Exchange and Resource Network (IW:LEARN), the Geneva Water Hub, the International Union for Conservation of Nature, and the Organization for Economic Cooperation and Development. The working languages will be English, French, Russian and Spanish. Eligible participants from countries with economies in transition and developing countries may apply for financial support and any such requests should be submitted to the UNECE secretariat (mayola.lidome@unece.org) as soon as possible, but not later than Monday, 4 September 2017. No application will be accepted after this deadline. Switzerland is part of the Schengen Area and obtaining a visa might take up to 5 weeks. Participants needing a visa are therefore requested to submit their application as soon as possible. Delegates attending the meeting are requested to register by 10 October 2017 using the following link https://www2.unece.org/uncdb/app/ext/meeting-registration?id=YFwzQE.