R. B. is a nickname. Notable people with the nickname include:
R. B. Bennett (1870–1947), Canadian lawyer R. B. Braithwaite (1900–1990), English philosopher R. B. Choudary (1892–1959), Indian film producer R. B. Fell (1859–1934), 4th Commander of the Ceylon Defence Force R. B. Greaves (1943–2012), American singer R. B. Kitaj (1932–2007), American artist R. B. Nunnery (1933–1988), American football player Dick Rutherford (1891–1976), American football and basketball coach
See also R. B. D. Blakeney (1872–1952), British Army general R. B. Winter State Park, park in Pennsylvania