Thomas Augustus Jaggar (June 2, 1839 – December 13, 1912) was an American prelate who was bishop of the Episcopal Diocese of Southern Ohio from 1875 to 1904.

He was educated in New York City by private tuition, before commencing preparation for the ministry while engaging in business.

[1] Jagger was ordained deacon on November 10, 1860, and became assistant at St George's Church in Flushing, Queens.

Following the election of Boyd Vincent as coadjutor in 1889, he was given oversight of American churches in Europe.

He resigned in October 1904, and was named the tenth rector of The Cathedral Church of St. Paul, Boston, Massachusetts in 1906.