Edward Trail Helfenstein (April 7, 1865 – December 22, 1947) was the eighth bishop of the Episcopal Diocese of Maryland, serving in that capacity from 1929 till 1943.

He also studied for a time at the Johns Hopkins University and then graduated from Virginia Theological Seminary in 1889.

He was ordained priest on March 9, 1890, in Emmanuel Church, Baltimore, also by Bishop William Paret.

[2] Between 1889 and 1890, he served as rector of Saint Mark's parish, covering Frederick and Washington counties.

[3] Helfenstein was elected Coadjutor Bishop of Maryland during a diocesan convention held in Baltimore in 1926.