Cecil Roberts Blackbeard (1900 – 19 April 1954) was a South African male tennis player who represented South Africa in the Davis Cup and the Olympic Games. He competed in the doubles event at the 1920 Summer Olympics. With compatriot George Dodd, he reached the quarterfinal round after victories over Alfred Beamish and Francis Lowe in the first round, followed by a win over Jean-Pierre Samazeuilh and Daniel Lawton in the second. In the quarterfinal they were defeated in four sets by Max Decugis and Pierre Albarran.