The Episcopal Diocese of Iowa is the diocese of the Episcopal Church in the United States of America which covers all of Iowa. It is in Province VI. Its offices are in Des Moines, and it has two cathedrals: the Cathedral Church of St. Paul in Des Moines and Trinity Cathedral in Davenport.

Trinity Episcopal Cathedral, formerly known as Grace Cathedral, is the historic cathedral in the Diocese of Iowa. The cathedral is located on the bluff overlooking Downtown Davenport, Iowa, United States. Completed in 1873, Trinity is one of the oldest cathedrals in the Episcopal Church in the United States. It was individually listed on the National Register of Historic Places in 1974. In 1983 the cathedral was included as a contributing property in the College Square Historic District, which is also listed on the National Register.