Robert Mayer

Robert Mayer may refer to:
 * Robert Mayer (ice hockey) (born 1989), Swiss ice hockey goaltender
 * Robert Mayer (philanthropist) (1879–1985), German-born British philanthropist
 * Robert Mayer (politician) (born 1957), president pro tem of the Missouri Senate
 * Robert A. Mayer (1933–2008), director of George Eastman House
 * Robert Mayer (journalist), author of the novel Superfolks (1977)
 * Bob Mayer (author) (born 1959)
 * Julius Robert von Mayer (1814–1878), German physician and physicist, and one of the founders of thermodynamics