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. After a year as house surgeon at Sir Patrick Dun's Hospital, he was commissioned into the Royal Army Medical Corps in 1906, and went to India the following year.