John Aloysius Maguire (8 September 1851 – 14 October 1920) was a Roman Catholic bishop who served as the Archbishop of Glasgow from 1902 to 1920.

[2][3] Following his ordination to the priesthood on 27 March 1875,[1][2] he became an assistant priest in St. Andrew's Pro-Cathedral, Glasgow, and Diocesan Secretary four years later.

[1][2] His consecration to the Episcopate on 11 June 1894; the principal consecrator was Archbishop Angus MacDonald of Saint Andrews and Edinburgh, with Bishop James August Smith of Dunkeld and Bishop William Turner of Galloway, serving as co-consecrators.

[6] His power of swaying a large multitude by oratory was demonstrated at the 19th International Eucharistic Congress, held in London in 1908, when he quieted the thousands of assembled Roman Catholics who were infuriated at the government's interference with the proposed procession of the Blessed Sacrament in the streets of Westminster.

[6] Archbishop Maguire died at his residence at Crosshill House in Glasgow on 14 October 1920, aged 69, and was buried in Old Dalbeth cemetery, Braidfauld.