Bob, Bobby, Rob, Robbie or Robert Ellis may refer to:
Academics
- Robert Ellis (academic) (born 1956), principal of Regent's Park College, Oxford
- Robert Ellis (scholar) (1820–1885), English classical scholar
- Robert Leslie Ellis (1817–1859), English mathematician and polymath
- Robert Ellis (artist) (born 1929), New Zealand artist and art professor
Actors
- Robert Ellis (actor, born 1892) (1892–1974), American film actor, screenwriter and film director
- Robert Ellis (actor, born 1933) (1933–1973), American child actor in the 1940s and 1950s
Musicians
- Bobby Ellis (born 1932), Jamaican trumpet player
- Rob Ellis (DJ), English radio DJ
- Rob Ellis (producer) (born 1962), English drummer, producer and arranger
- Rob Ellis, bass player for the American rock band Seven Wiser
- Robert Ellis (guitarist), country music singer-songwriter
- Robert Ellis (musician), bass trombone player in the folk band La Bottine Souriante
Politicians
- Robert Ellis (fl.1406), Member of Parliament (MP) for Great Yarmouth in 1406
- Robert Ellis (fl.1414-1422), MP for Great Yarmouth, son of earlier MP
- Sir Robert Ellis, 1st Baronet (1874–1956), British Conservative MP 1922–1923, 1924–1929, 1931–1945
Sportsmen
- Rob Ellis (baseball) (born 1950), major league baseball outfielder in the 1970s
- Robert Ellis (baseball) (born 1970), major league baseball pitcher in the 1990s
- Robert Ellis (cricketer) (1853–1937), English cricketer
- Rob Elowitch (born 1943), American professional wrestler known by the ring name Robbie Ellis
Writers
- Bob Ellis (1942–2016), Australian journalist
- Robert Ellis (author) (born 1954), American crime fiction writer