Darby Briton Loudon (12 March 1897 – c. 1963) was a New Zealand born rugby union player, a flanker who made sixteen representative appearances for the New South Wales state team in the 1920s.
[2] The Sydney club rugby competition started up again after World War I in 1919 and Loudon was captain of the Sydney University Football Club the premiership winners, also winning himself a University Blue that year.
He captained the side in matches against an AIF Rugby XV who toured NSW and Queensland and led by former Wallaby Lieutenant Willie Watson did much to rekindle public attention in rugby union in the Australian eastern states.
Thus Loudon's appearance against a New Zealand XV at Lancaster Park in September 1921 marked his international Test rugby debut.
[1] So decreed also were the three matches Loudon played for New South Wales in 1922 when a New Zealand Māori rugby union team toured to Sydney.