The 4th International Conference on Catalysis, Chemical Science and Technology (ICCST 2026) will take place online from July 15–17, bringing together leading researchers, innovators, and industry experts from around the world. This three-day virtual event features a plenary forum, 12 focused breakout sessions, and a dynamic poster exhibition. Key themes span Organic and Metallic Chemistry, Catalysis Innovation, Medicinal Chemistry, Chemical Biology, Electrocatalysis, and Electrochemistry. ICCST 2026 provides a collaborative platform for sharing cutting-edge discoveries, discussing emerging trends, and fostering new scientific partnerships. By uniting diverse perspectives across academia and industry, the conference aims to inspire breakthroughs that will shape the future of catalysis and chemical science.