Inspired by the global impact of the celebrations of the 250th anniversary of the birth of Alexander von Humboldt (14 September 1769 – 6 May 1859), the International Biogeography Society launched – International Humboldt Day – an annual celebration of Humboldt’s legacy and the breadth of research that was prompted by his pioneering work in botanical geography, during the week surrounding September 14th. International Humboldt Day is envisioned as focused, biogeography related events around the world, that bring together researchers and institutions through the organization of local presentations, activities, and online offerings.