Joseph Rademacher (December 3, 1840 – June 12, 1900) was an American prelate of the Roman Catholic Church.

[1] Rademacher was ordained to the priesthood for the Diocese of Fort Wayne by Bishop John Luers on August 2, 1863.

[2] In 1872, Rademacher was appointed chancellor of the diocese and pastor of St. Mary's Parish in Fort Wayne, Indiana.

[1] On April 3, 1883, Rademacher was appointed as the fourth bishop of the Diocese of Nashville by Pope Leo XIII.

[3] He received his episcopal consecration on June 24, 1883, from Archbishop Patrick Feehan, with Bishops Joseph Dwenger and John Watterson serving as co-consecrators.