We are pleased to announce the International Workshop on Fixed Field Alternating gradient accelerators - FFA'25, which will be held at Imperial College in London, UK from September 16th to September 19th. The 2025 session follows the numerous fruitful past workshops, which supported the rebirth and the rise of FFAs during the last years. It will give the opportunity to report on the on-going experiments and discuss the most recent FFA concepts and designs. The proposed preliminary topics are: optics and dynamics of FFAs, scaling FFAs, non-scaling FFAs, correction of orbit and optics, injection and extraction, insertion, commissioning of FFA machines and components; applications in medical field, and industry.