Thomas Michael O'Leary (August 16, 1875 – October 10, 1949) is an American prelate of the Roman Catholic Church.

[3] According to author Kevin Donovan, O'Leary was considered to be rigid, unapproachable and distant by his fellow clergy, and they were not sorry to see him go to Springfield.

[4] He received his episcopal consecration on September 8, 1921, from Archbishop Arthur Alfred Sinnott, with Bishops Michael Curley and George Guertin serving as co-consecrators.

[4] During his tenure, O'Leary introduced the Passionists and Sisters of Providence, expanded Mercy Hospital in Springfield and opened 24 new parishes.

He described the college's educational aims:... to speak convincingly, write gracefully, spend leisure time profitably, and assume responsibility easily.