NASA’s STEM Engagement & Internships (High School)

International Astronomy and Astrophysics Competition (IAAC)

MIT Research Science Institute (RSI - includes astrophysics)

Harvard-Smithsonian Youth Astronomy Programs

European Space Agency (ESA) Education Programs

CosmoQuest (NASA Citizen Science Astronomy Projects)

Zooniverse – Planet Hunters (TESS exoplanet detection)

Sky & Telescope Youth Astronomy Portal

International Olympiad on Astronomy and Astrophysics (IOAA)