Robert O'Brien (born June 6, 1933) is an American sprint canoer who competed in the late 1950s and early 1960s. Competing in two Summer Olympics, he earned his best finish of 11th in the K-1 10000 m event at Melbourne in 1956.

References
Sports-reference.com profile

1933 births
American male canoeists
Canoeists at the 1956 Summer Olympics
Canoeists at the 1960 Summer Olympics
Living people
Olympic canoeists for the United States