Tobias Mullen (March 4, 1818 – April 22, 1900) was an Irish-born clergyman of the Roman Catholic Church. He served as bishop of the Diocese of Erie in Pennsylvania from 1868 to until his death in 1899.
After completing his theological studies, he was ordained to the priesthood for the Diocese of Pittsburgh by Bishop O'Connor on September 1, 1844.[3] He served for about two years as curate at the Cathedral of Pittsburgh, and was afterwards charged with the care of congregations at Johnstown and in Jefferson County.[1] He was transferred to the rectorship of St. Peter's Church at Allegheny in 1854, and served as vicar general of the Diocese of Pittsburgh from 1864 to 1868.[2]
During his 31-year-long administration many priests were ordained, parishes established, churches and schools built, and conferences for the clergy held.[4] He also founded the weekly Lake Shore Visitor, an orphanage, and two hospitals.[4] His greatest accomplishment was the erection of St. Peter's Cathedral.[5] Originally dubbed as "Mullen's Folly", its cornerstone was laid in 1875 and it was later dedicated in 1893.[5]Mullen suffered a paralytic stroke on May 20, 1897.[5] He received John Fitzmaurice as his coadjutor bishop in 1898.[4]
Tobias Mullen remained in ill health until his death at on April 22, 1900, at age 82.