The biennial Bayes Comp meetings are organized by the Bayesian Computation Section of the International Society for Bayesian Analysis. Bayes Comp 2025 is the fourth conference in the series and is hosted by the Department of Statistics and Data Science at the National University of Singapore. Confirmed keynote speakers are Sylvia Fruhwirth-Schnatter, Pierre Jacob and Emtiyaz Khan. The scientific committee welcomes applications for satellite workshops, to be held at NUS in the lead up to the main conference (June 16-17), as well as invited session proposals that will take place during the main conference (June 18-20). The deadline for proposals is midnight October 31st (Singapore time), please see the conference website for further details. A call for contributed sessions and posters will be made in early 2025.