We are pleased to invite you to join us in the beautiful city The Hague for IUPAC|CHAINS2023 in August 2023. During the conference, themed ‘Connecting Chemical Worlds', we bring together all disciplines of chemistry, a diverse audience of chemists from both academia and industry, and from all around the globe. Apart from plenary and keynote lectures, the congress will include parallel sessions with oral presentations, working group meetings and poster presentations by junior and senior researchers.The conference consists of several parts, namely the 52nd IUPAC General Assembly (18-25 August 2023) and the 49th IUPAC World Chemistry Congress combined with the 11th edition of CHAINS, the largest chemistry congress from the Netherlands (20-25 August 2023).