Rob Johnson may refer to:

Robert James Johnson (born July 22, 1982) is an American former professional baseball catcher and pitcher. Johnson played Major League Baseball from 2007 to 2013, predominantly for the Seattle Mariners.

Robert M. Johnson is an American politician. He served on the Seattle City Council representing the fourth district, covering northeast Seattle and the area around the University of Washington, from 2016 until his resignation in April 2019.