The 1st International Symposium on Terahertz Nanoscience (TeraNano 2011) and 2nd Workshop of International Terahertz Research Network (GDR-I THz 2011) will jointly take place at Nakanoshima Center, Osaka University, in Osaka, Japan, from Nov. 24 (Thursday) to 29 (Tuesday), 2011. This symposium provides a forum for the exchange of information on the basic science, technology, and applications of terahertz (THz) waves. Although it will cover all aspects of THz science and technology, we will emphasize the advantages of combining the interdisciplinary domains of nanotechnology and THz technology, especially the field of THz science in nanomaterials and nanodevices. The conference will place special emphasis on international collaborations in research and education in this highly interdisciplinary and increasingly global field . Invited talks on current status and future prospects by leading researchers will be given as well as some contributed oral and poster presentations.