Robert Collier

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