Welcome to the 9th International Conference on Hypervalent Iodine Chemistry (ICHIC-9), to be held at IQS (Institut Químic de Sarrià) in Barcelona from 5 to 8 July 2027. Hypervalent iodine chemistry is a vibrant and rapidly evolving field spanning organic, inorganic, and physical chemistry. Join us for an exciting scientific programme in the beautiful and dynamic Mediterranean city of Barcelona, where you can share your latest results, discover new developments across the breadth of hypervalent iodine chemistry, and strengthen connections within our international community.