Sir John Alexander Boyd KCMG (April 23, 1837 – November 23, 1916) was a Canadian lawyer and judge.

[1] Educated at Upper Canada College and the University of Toronto,[1] Boyd began his career in 1860 when he was articled to David Breakenridge Read.

[3] Boyd wrote the trial decision in St Catharines Milling and Lumber Co v R, in which he ruled for Ontario, rejecting the concept of Aboriginal title.

[4] In 1903, Boyd and William Glenholme Falconbridge were appointed to a royal commission to investigate charges of bribery brought forward by Robert Roswell Gamey against the Liberal Government of the time.

Although the commission found no proof for these allegations, the provincial Conservatives won the general election that followed two years later.