Robert H. McNaught (born in Scotland in 1956) is a Scottish-Australian astronomer at the Research School of Astronomy and Astrophysics of the Australian National University (ANU).
The inner main-belt asteroid 3173 McNaught, discovered by Edward Bowell at Anderson Mesa Station in 1981, was named after him by its discoverer, following a suggestion by David Seargent.
McNaught is a prolific discoverer of asteroids and comets, described as “the world’s greatest comet discoverer” and he participated in the Siding Spring Survey (SSS) using the ANU’s Uppsala Southern Schmidt Telescope. He discovered the Great Comet C/2006 P1 on August 7, 2006, the brightest comet in several decades, which became easily visible to the naked eye for observers in the Southern Hemisphere. The SSS was the only active Near Earth Object survey in the Southern Hemisphere. The survey ended in 2013 after funding dried up.