Robert Briton Loudon (24 March 1903 – 6 October 1991) was a New Zealand born rugby union player, a flanker who made twenty-three representative appearances for the New South Wales state team in the 1920s.
After rugby union restarted in Queensland in 1929, and national selections were made from the two states Loudon played in six further full Australian Wallaby Test sides.
[2] Loudon made his representative debut on the New South Wales tour to New Zealand in 1923 as a versatile back.
[2] He made a Test appearance in 1929 again opposite New Zealand and then in 1933 was selected for the first-ever Wallaby tour of South Africa.
In 1934 he made further state representative appearances for New South Wales and played his final Test match, all against New Zealand in Sydney.