Robert "Bob" Chiarelli (born September 24, 1941) is a politician in Ontario, Canada. He is a Liberal member in the Legislative Assembly of Ontario who served from 1987 to 1997, and then was subsequently re-elected to the legislature in 2010. He was the Regional Chair of Ottawa-Carleton from 1997 to 2001 and was mayor of Ottawa from 1997 to 2006. He has served in the provincial cabinets of Dalton McGuinty and Kathleen Wynne.