The 2025 URSI Asia-Pacific Radio Science Conference (AP-RASC 2025) is hosted by the International Union of Radio Science and is being held in Sydney from 17-22 August 2025. This triennial conference is one of the three URSI Flagship Conferences, which also include the URSI General Assembly and Scientific Symposium (URSI GASS) and the URSI Atlantic Radio Science Conference (URSI AT-RASC). URSI AP-RASC 2025 will host approximately 500 delegates and include scientific sessions, workshops and social activities. Research fields covered in the program include Radiocommunication Systems and Signal Processing, Electronics and Photonics, Electromagnetic Environment and Interference, Wave Propagation and Remote Sensing, Ionospheric Radio and Propagation, Radio Astronomy, and Electromagnetics in Biology and Medicine. The scientific program features a series of open and convened sessions covering the areas of URSI Commissions A to K, comprising oral/poster sessions with invited and contributed papers and General Lectures.  Additionally, there are workshops, short courses, young scientist programs and an exhibition.