The 17th International Congress of Immunology (IUIS 2019) will be held from October 19 – 23, 2019 at the China National Convention Centre, Beijing, China. The Congress is co-organized by the International Union of Immunological Societies (IUIS) and the Chinese Society for Immunology (CSI). On behalf of the IUIS 2019 Steering Committee and CSI I would like to invite you to attend the Congress. We hope you will join us for a symphony of outstanding science, and enjoy your time in Beijing, a city of China’s thousand years civilization. You may also visit other cities and explore beauty and diversity of China after or before the meeting. We look forward to welcoming you to Beijing for the IUIS 2019.