Robert Colin Marshall (May 19, 1883 – February 20, 1962) was a politician in Alberta, Canada. Marshall served as the 20th Mayor of Calgary, Alberta from 1919 to 1921, and as a Member of the Legislative Assembly of Alberta. Marshall was born in Ingersoll, Ontario in 1883 to parents Peter Marshall and Katherine Allen. He arrived in Calgary in 1906 and started working for the Crown Paving Company Limited. Marshall was associated with this company until its sale in 1961. Marshall died in 1962 while holidaying in Fort Lauderdale, Florida.