The Pure and Applied Chemistry International Conference 2024 (PACCON 2024) has just passed with great success. I would like to welcome you to join us again at PACCON 2025. PACCON is the annual conference organized by the Chemical Society of Thailand. Every year, a selected academic institution in Thailand will alternately co-host the conference. The conference will contain plenary lectures given by world-renowned chemists, invited talks, and oral and poster presentations on topics of current interest in chemistry. The chemistry community in Thailand is huge. We have around 1,000 participants for the conference each year. The Pure and Applied Chemistry International Conference 2025 or PACCON 2025 will be held on Feb 13 – 15, 2025, and will be co-hosted by Suranaree University of Technology. The theme of the conference is “Chemistry for a Changing World“. The proposed venue is Khao Yai Convention Center (KYCC) which can accommodate up to 5,000 guests. The KYCC is in the vicinity of Khao Yai National Park, the largest natural forest reserve in Thailand, where accommodations are plentiful. We hope to see you all at the PACCON 2025 where you can enjoy good research discussions, communications with colleagues, research networking, etc., and last but not least beautiful nature of Khao Yai. Please make up your schedule now for PACCON 2025. We are looking forward to seeing you there.