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Peter C. Theisinger (born 1945 in Fresno, California) is the director of the Engineering and Science Directorate at the Jet Propulsion Laboratory in Pasadena, California and was the project manager of NASA's Mars Exploration Rover Mission and later project manager for the 2011 Mars Science Laboratory mission. He is currently director for the Engineering and Science Directorate at the Jet Propulsion Laboratory.
Theisinger graduated from the California Institute of Technology in 1967 with a bachelors degree in physics. He joined NASA's Jet Propulsion Laboratory (JPL) as payload integration engineer that year and except for a three-year span in the early 1980s has worked at JPL since. Among the missions on which he has participated were the 1967 Mariner 5 flyby mission to Venus, the 1971 Mariner 9 orbiter mission to Mars, the Voyager mission to the outer planets of the solar system, the Galileo mission to Jupiter, and the Mars Global Surveyor orbiter.
In 2013, Theisinger, along with Richard Cook, was named one of Time Magazine's 100 Most Influential People in the World  as a pioneer for his role in getting the Curiosity Rover to Mars safely in August 2012.
- "Peter C. Theisinger Director, Engineering and Science Directorate". Jet Propulsion Laboratory. Retrieved 1 January 2011.
- Bridges, Andrew (January 25, 2004). "Spirit of Opportunity". Beaver County Times. Retrieved 1 January 2011.
- "Peter Theisinger - Biography". John F. Kennedy Space Center. Retrieved 1 January 2011.
- "The 2013 Time 100: Pioneers--Peter Theisinger and Richard Cook".