With a broad focus on STEM education, STEMEdhub.org brings together university researchers in STEM disciplines with other researchers, k-12 teachers/practitioners, students and the public through the various groups and projects on the site. Built on Purdue’s HUBzero architecture, STEMEdhub.org is a fully functional Gateway that facilitates the hosting of interactive scientific tools, online presentations, wikis, or documents such as assessment plans and courses for downloading or interactive editing, complemented by document tagging to enable searching and a rating tool for commenting on shared resources. STEMEdhub has been used for over 8 years to build capacity in many areas of STEM Education in the United States and throughout the world. It currently hosts over 6000 users in 160 user groups with over 1300 published resources. More importantly, STEMEdhub.org allows users themselves to create and manage their own groups, resources and communities of practice enabling it to exist on very little overhead with a small staff. While other Scientific Gateways focus on high performance computing capabilities, STEMEdhub is focused on using a Scientific Gateway platform to make connections, build partnerships and engage students. This Demo will show how STEMEdhub.org is used as a Scientific Gateway to build STEM Education Capacity throughout the world.