St. Paul's Episcopal Cathedral, is located in downtown Des Moines, Iowa, United States.

The building was listed on the National Register of Historic Places as St. Paul's Episcopal Church.

St. Paul's had its beginnings on October 15, 1854, when the first service was held at Fort Des Moines for ten communicants.

Foster had studied architecture as an apprentice under Richard Upjohn, an early proponent of the use of Gothic Revival.

The building was designed by Brooks Borg Architects and Engineers of Des Moines.

The new addition created space for classrooms, clergy and staff offices, the Guild Hall, and a chapel.

Further renovations were undertaken to the chancel area when St. Paul's was made the cathedral of the diocese.

The cathedra (Bishop's chair), hand carved by a local artist, was installed in 1993, as was the current pipe organ.

The St. Sacrament Chapel was added at this time, reusing the original tabernacle, and providing accessibility for communicants with mobility challenges.

Over the years St. Paul's has assisted in the establishment of new mission churches in the Des Moines area.

Present at the ceremony was the founding Dean, Michael Barlowe (later Executive Officer of the General Convention of the Episcopal Church), and Ted Luscombe, the retired Bishop of Brechin and former Primus of the Scottish Episcopal Church.

[1] While the 1952 parish house is not considered as significant, it does reflect the Gothic style of the church and therefore does not detract from it.

The cathedral is also significant as the last religious building in a four-block section of downtown known as "Piety Hill."

[1] The exterior walls are load-bearing masonry, and are composed of broken faced red granite that is laid in random ashlar.

There are seven windows on the apse wall depicting Jesus Christ, the Four Evangelists, St. Peter, and St. Paul.

The Guild Hall on the street-side of the parish house is clad in red granite like the cathedral.

[8] It is equipped with three manuals, seven divisions, 84 stops, 51 registers, 68 ranks, 3904 pipes, and electro-pneumatic (EP) chests.