Scott Jay "Doc" Horowitz (born March 24, 1957) is a retired American astronaut and a veteran of four space shuttle missions.

After earning his undergraduate degree in engineering from California State University, Northridge in 1974-1978, Horowitz earned a doctorate in aerospace engineering from the Georgia Institute of Technology (1982) and worked as a scientist for Lockheed Company. He joined the United States Air Force and flew as a T-38 and F-15 pilot while also teaching courses in aircraft design and propulsion at Embry-Riddle Aeronautical University and later California State University, Fresno. He graduated from the United States Air Force Test Pilot School in Dec, 1990 as a member of class 90-A. Horowitz was selected as an astronaut candidate by NASA in 1992, and piloted missions STS-75 (1996), STS-82 (1997) and STS-101 (2000). He commanded mission STS-105, a visit to the International Space Station for equipment and crew transfer.