Robert W. Peterson (19 October 1937 – 4 November 2020) was a Canadian Liberal senator from Saskatchewan.

He was appointed to the Senate by Prime Minister Paul Martin on March 24, 2005.

Peterson was an entrepreneur, professional engineer and community activist.

He was the chief operating officer of Denro Holdings Ltd, and sat on the board of directors for General Properties Ltd and Cameco Corporation, a position he has held since 1994.

Peterson received a Bachelor of Science degree in Civil Engineering from the University of Saskatchewan.