William H. Ilgenfritz, SSC (born 1946), is an American Anglican bishop. He is married to Lois and the couple has 2 children and 6 grandchildren. He studied at the Trinity School for Ministry, since 1981, and was ordained as an Episcopal priest in 1986. He was the Rector of Mount Calvary Church, in Baltimore, Maryland, from 1994 to 2000. He also served as chaplain at St. Jude's Ranch for Children, in Nevada, and was the Executive Director of the Children's Aid Society.