It is our great pleasure to invite you to the 19th International Symposium on Advanced Organic Photonics (ISAOP-25) which will be held on May  21 & 22, 2025, at National School of Applied Sciences of El Jadida, Chouaib Doukkali University, El Jadida, Morocco. The scientific program will concern all aspects of Functional Organic/Polymeric Materials for Advanced Photonics and Inorganic/Organic Nano and hybrid Materials for Optoelectronics, Nanotechnology and environmental technology, smart materials, and Microelectronics, which have potential applications. ISAOP-25 will serve as a forum for the discussion of state-of-the-art results pertaining to optical devices using organic-based photonic materials as well as their applications. Various aspects of organic and polymeric photonic materials and devices will be discussed.