Robert Irwin may refer to:
- Robert Irwin (politician) (1865–1941), Canadian politician
- Robert Irwin (artist) (born 1928), American installation artist
- Robert Irwin (writer) (born 1946), British historian, novelist and writer on Arabic literature
- Robert Irwin (real estate) (fl. 20th c.), American real estate broker and expert
- Robert George Irwin (1908-1975), American sculptor convicted in 1937 murder spree in New York City
- Robert Walker Irwin (1844-1925), American businessman and Hawaiian representative to Japan
- Bob Irwin (born c. 1940), Australian animal conservationist and father of Steve Irwin
- Robert "Bob" Irwin (born 2003), son of Steve Irwin
- Robert Irwin (Baritone), {Born: September 20, 1905 - Dublin, Ireland, Died: 1983) Irish Tenor.