The “2013 International Symposium on Electromagnetic Theory” (EMTS 2013) will be held in Hiroshima, Japan, from May 20 to 24, 2013. It is organized by Commission B (Fields and Waves) of the International Union of Radio Science (URSI) and the Electronics Society of The Institute of Electronics, Information and Communication Engineers (IEICE). EMTS 2013 is the 21st event in a triennial series of international symposia with a long history since 1953. Its scope covers all areas of electromagnetic theory and its applications. The working language of the Symposium is English.