John Patrick Treacy (July 23, 1891 – October 11, 1964) was an American lawyer and prelate of the Roman Catholic Church who served as bishop of the Diocese of La Crosse in Wisconsin from 1948 until his death in 1964.

[1] He attended the College of the Holy Cross in Worcester, Massachusetts, and studied at Harvard Law School before enrolling at the Catholic University of America in Washington, D.C.[2] Following his graduation from the Catholic University in 1912, Treacy returned to Massachusetts and studied at St. John's Seminary in Boston.

[3] After 12 years in parish work, Treacy became diocesan director of the Society for the Propagation of the Faith in 1931.

[1] In 1939, he was named by President Franklin D. Roosevelt to a 25-member committee for a good-neighbor mission to Latin America.

1945. from Archbishop Amleto Giovanni Cicognani, with Bishops Edward Hoban and William O'Brien serving as co-consecrators.