The 4th Int'l Conference on Heat Transfer and Thermophysics (HTT 2023) will be held from August 11-13, 2023 in Xiamen, China. This Conference will cover issues on Heat Transfer and Thermophysics. It dedicates to creating a stage for exchanging the latest research results and sharing the advanced research methods. HTT 2023 will be an important and reliable platform for inspiring international and interdisciplinary exchange at the forefront of Heat Transfer and Thermophysics. The Conference will bring together academicians, engineers, educators and policy-makers from all over the world, and we hope that you will take this opportunity to join us for academic exchange and visit the city of Xiamen.