Major Robertson "Robbie" Stewart Smyth (18 August 1879 – 5 April 1916) was an international rugby player, who represented Ireland and Great Britain.

Born in County Down, Ireland, he went to Dungannon Royal School, then studied medicine at Trinity College, Dublin, where he obtained his doctorate in 1904.

At the outbreak of the First World War, Smyth went to the Western Front, and remained there until December 1915, when he was invalided by exposure to gas, and retired to London.

England had lost all three games of the Home Nations championship in 1903, but after obtaining a draw against Wales in January 1904, its prospects against Ireland looked stronger.

The Irish forwards contingent, including Smyth, was regarded as 'very strong', all eight of them having played international rugby, but the backs appeared weaker.

[8] After Smyth graduated from Dublin University in 1904, he played rugby for Wanderers, and was part of the team that won the Leinster Senior Cup in 1906.