The Joint Meeting of the Belgian and Italian Sections of the Combustion Institute, including the 45th Annual Meeting of the Italian Section (ASICI), will take place in Florence, Italy, from 28-31 May 2023. The style of the meeting will conform to the informal nature of these events. Its aim is to allow the exchange of expertise and discussion between scientists and technologists working in the field of combustion, in all its fundamental and applied aspects, as well as in neighboring fields (pyrolysis, gasification, fuel processing, and upgrading), with specific emphasis on low emission and sustainable technologies. Participation of Ph.D. students and young researchers in the meeting is warmly solicited. The meeting will consist of parallel sessions for oral presentations, and a work-in-progress poster session will also be available. Each morning session will be opened by a plenary lecture.