Discover the Book of Abstracts for the 4th World Conference on Chemistry and Chemical Engineering & 4th World Conference on Advanced Materials, Nanoscience and Nanotechnology, held on November 13-14, 2023, in the beautiful city of Bangkok, Thailand. This compilation showcases cutting-edge research and scholarly contributions across these vital fields, highlighting the interdisciplinary dialogues and innovative themes that emerged. Featuring insights from esteemed participants, including keynote speakers renowned in their respective disciplines, this collection encapsulates the spirit of collaboration and forward-thinking that characterized the conference. Delve into these pages to uncover the rich tapestry of knowledge woven together at an event shaping the future directions in chemistry and chemical Engineering and materials, nanoscience and nanotechnology.