The 15th International Conference on Informatics, Environment, Energy and Applications (IEEA 2026) will be held in Osaka, Japan, during February 6-8, 2026. IEEA conference is initiated by Science and Engineering Institute, USA and assisted by National University of Ireland Galway, Ireland, University of Wollongong, Australia, Tokai University, Japan, Agriculture University, China, Chulalongkorn University, Thailand and German University in Cairo, Egypt This is an annual conference started in Singapore, 2012. Then, it was successfully held in major cities, such as Bali, Shanghai, Pattaya, Hong Kong, Jeju Island, Beijing, Osaka, Amsterdam, Tokyo. It has been attended by more than 500 participants from 20 countries. On behalf of the Organizing Committee, we warmly invite you, informatics, environment, energy and applications scientist, engineer or technician, graduate student, or simply interested by the technique, to take part in this unique and innovative conference with your enthusiasm to develop, your desire to apply and your willingness to mature the informatics, environment, energy and applications.