Reginald Alexander Douglas (born 19 April 1930) is a former New Zealand rower.

[1] At the 1954 and 1958 British Empire and Commonwealth Games he twice won the gold medal in the men's coxless pair alongside Bob Parker.

He also won the silver medal in the men's double sculls at the 1954 British Empire Games also partnering Parker.

[2] Douglas and Parker also competed together at the 1956 Summer Olympics in Melbourne, finishing third in their semi-final in the coxless pair, missing out in a place in the final.

[1] In September 2023 Douglas was acknowledged as New Zealand's oldest living Olympian.