Ralph Douglas Doubell AM (born 11 February 1945) is an Australian former athlete, and gold medallist at the 1968 Summer Olympics.

[3] Doubell's first major international victory in 800 metres was at the World Student Games in Tokyo in 1967 in a time of 1:46.7.

[1] Doubell, however, was able to recover in time for Mexico City and won the 800 m gold medal, passing the pre-race favourite Wilson Kiprugut of Kenya down the straight to win in a world record equalling time of 1:44.3.

[1] Doubell also won the 800 metres gold medal at the 1969 Pacific Conference Games, in a time of 1:48.0.

[4] Doubell had planned to compete at the 1972 Olympics in Munich, but was prevented from doing so by calf injuries, which brought on his retirement from competitive athletics.