The Shuttle Propulsion Office, or SPO, is part of NASA's Space Shuttle team.

The Office of Space Flight at NASA Headquarters in Washington, D.C., oversees NASA's space flight programs, including the Shuttle.

The Space Shuttle Program Office at Johnson Space Center (JSC) near Houston, has overall responsibility for the Shuttle program.

The Marshall Space Flight Center's (MSFC) SPO reports to the Shuttle Program Office, and to the MSFC Director.

The SPO is organized into five offices: Space Shuttle Main Engine (SSME), External Tank (ET), Reusable Solid Rocket Motor (RSRM), Solid Rocket Booster (SRB), and Propulsion Systems Engineering and Integration (PSE&I).

The project offices are responsible for ensuring that their respective hardware meets the Shuttle program's technical, schedule and performance requirements. Each project manages the activities of a prime contractor, which, in turn, manufactures, tests, and assembles the propulsion components.

Behind each prime contractor are hundreds of smaller companies across the country that supply various Shuttle system components.

The Wernher von Braun Complex at Marshall Space Flight Center houses the SSPO and related offices.