John Alexander Weir (December 13, 1894 – June 3, 1942) was a Canadian attorney, and the first Dean of the University of Alberta Faculty of Law from 1926 to 1942.

Weir joined the Army Medical Corps in 1916 and transferred to the Royal Air Force where he was sent overseas.

[3] In 1918, he resumed his Rhodes Scholarship at Merton College, Oxford,[4] where he received his Bachelor of Arts in the School of Jurisprudence with first class honours.

He took care of administrative tasks which were necessary for running the law school, in addition to teaching a number of courses.

[7] Dr. Francis G. Winspear, who was teaching accounting at the University of Alberta at the time and shared an office with Dean Weir for a year, described him as a "dedicated lawyer" who "was untiring in his devotion to the students".