Robert Collier may refer to:
Robert Collier, 1st Baron Monkswell (1817–1886), English judge Robert Collier, 2nd Baron Monkswell (1845–1909), Liberal politician Robert Collier, 3rd Baron Monkswell (1875–1964), British aristocrat and writer Robert Collier (author) (1885–1950), author of self-help and metaphysical books Robert J. Collier (1876–1918), publisher and aviation enthusiast
See also Rob James-Collier (born 1976), British actor, currently in Coronation Street Robert Collyer (disambiguation), several people