Astronauts are not represented by unions. The National Aeronautics and Space Administration, other government-funded space agencies, and commercial space companies employ astronauts.
- Aeronautical and Aerospace Technicians
- Aerospace Engineers
- Aerospace Medicine Physicians
- Aircraft Mechanics
- Astrobiologists
- Astrogeologists
- Astronomers
- Astrophysicists
- Avionics Engineers
- Avionics Technicians
- Biologists
- Build Reliability Engineers
- Chemical Engineers
- Chemists
- Computer Programmers
- Drone Engineers
- Drone Manufacturing Workers
- Drone Pilots
- Drone Repair Technicians
- Electrical Engineering Technologists
- Electrical Engineers
- Electronics Engineering Technicians
- Electronics Engineers
- Engineers
- Flight Instructors
- Geographic Information Systems Specialists
- Hypersonics Engineers
- Hypersonics Technicians
- Industrial Engineers
- Laboratory Testing Technicians
- Manufacturing Engineering Technologists
- Manufacturing Engineers
- Materials Engineers
- Mechanical Engineers
- Molecular and Cellular Biologists
- Non-Destructive Testing Specialists
- Physicists
- Pilots
- Reusable Spacecraft System Designers and Engineers
- Robotics Engineers
- Robotics Technicians
- Space Habitat Designers
- Space Lawyers
- Space Meteorologist
- Space Pilots
- Space Port Managers
- Space Systems Operators
- Space Tourism Managers
- Spacecraft Test Technicians