The 9th International Conference of Fluid Flow, Heat and Mass Transfer (FFHMT’23) aims to become the leading annual conference in fields related to fluid flow and heat transfer. The goal of FFHMT is to gather scholars from all over the world to present advances in the fields of transport phenomena and to foster an environment conducive to exchanging ideas and information. This conference will also provide an ideal environment to develop new collaborations and meet experts on the fundamentals, applications, and products of the mentioned fields. Topics for FFHMT’23 include, but are not limited, to the following: Biofuels Boiling and condensation CFD Combustion Drying Energy optimization Experimental fluid dynamics Flow, heat and mass transfer devices Fuel cells Gas liquid operations Heat transfer augmentation applications Heat transfer enhancement active methods HVAC Laminar and turbulent flows Leaching Mass transfer coefficient Molecular diffusion Nanofluid Non-Newtonian flow Polymer processing Renewable and non-renewable energies Rheology Separation processes