Risk assessments for industrial facilities are essential for the prevention of industrial accidents. The United Nations Economic Commission for Europe (UNECE) Convention on the Transboundary Effects of Industrial Accidents aims to help its Parties prevent, prepare for, and respond to industrial accidents, especially ones that can have transboundary effects. It also fosters transboundary cooperation among its Parties and beyond. As risk assessment is enshrined in the Convention's provisions, UNECE held a seminar on risk assessment methodologies (Geneva, 4 December 2018) to support countries in implementing the relevant provisions. The seminar resulted in conclusions and recommendations on the challenges in executing transboundary risk assessment for industrial facilities and the need for more information exchange on risk assessment methodologies used in the UNECE region, including available software.