The 2021 IEEE AP-S Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting will be held on 4-10 December 2021, at Marina Bay Sands, Singapore. The joint conference is sponsored by the IEEE Antennas and Propagation Society (AP-S) and the US National Committee (USNC) of the International Union of Radio Science (URSI). The technical sessions and short courses will provide a comprehensive and well-balanced program. This joint conference is intended to provide an international forum for the exchange of information on state-of-the-art research in antennas, propagation, electromagnetic engineering, and radio science. The paper submission deadline is 15 May 2021.