Robert, Bob, Bobby, or Rob Collins may refer to:
- Bob Collins (footballer, born 1934), Australian rules footballer for Footscray
- Bob Collins (footballer, born 1937), Australian rules footballer for Fitzroy
- Bobby Collins (footballer) (1931–2014), Scottish footballer
- Bobby Collins (American football coach) (1933–2021), American football coach
- Bobby Collins (tight end) (born 1976), former tight end in the National Football League
- Bobby Collins (basketball) (born 1966), American college basketball coach
- Rob Collins (ice hockey) (born 1978), Canadian ice hockey player
- Rip Collins (catcher) (Robert Joseph Collins, 1909–1969), backup catcher in Major League Baseball
- Robert Collins (rower) (1924–2012), British rower
- Robert Collins (physician) (1800–1868), Irish physician
- Robert Collins (British Army officer) (1880–1950), British general
- Robert L. Collins (1930–2011), American writer and director, creator of Police Woman
- Robert Frederick Collins (born 1931), U.S. federal judge
- Robert M. Collins, United States Army general
- Robert Collins, lynched in Summit, Pike County, Mississippi on June 20, 1922, see Lynching of Robert Collins