James Barnett Allison (28 June 1880 – 31 March 1907) was an Irish rugby union international who played twelve Test matches for the Irish national team between 1899 and 1903.
Born in Monaghan in what is now the Republic of Ireland, he was a student of Campbell College, Queen's University Belfast, and the University of Edinburgh, and played as a centre.
Regarded as one of the most agile centres of his generation, match reports from the period show he gained a reputation for rigorous tackling and accurate kicking, scoring a drop goal for Ireland against England at the Athletic Ground, Richmond in 1900.