St. Mark's Episcopal Cathedral located at 231 E. 100 South in Salt Lake City, Utah is the cathedral church of the Diocese of Utah in the Episcopal Church in the United States of America. Built in 1871, it is the third oldest Episcopal cathedral in the United States and the second oldest continuously used worship building in Utah. On September 22, 1970, it was added to the National Register of Historic Places.

The original cornerstone was laid in 1870 under the supervision of Bishop Daniel Sylvester Tuttle with funding from Episcopalians in New York and Pennsylvania. The cathedral was consecrated on May 14, 1874. A fire in 1935 gutted the sanctuary, but the church was rebuilt following the original design.

The early Episcopal Church left its mark in the community such that by 1880, members of the church had established Saint Mark's School for Boys, Rowland Hall School for Girls, and Saint Mark's Hospital. Rowland Hall / St. Mark's School is now merged and offers education today for K–12.

St. Mark's Cathedral was built by architect Richard Upjohn in the Gothic Revival style. It has some of the finest stained glass in the state of Utah including four Tiffany Studios windows dated 1916, three windows designed by Charles Jay Connick, and one designed by Franz Xaver Zettler.

Current outreach includes Hildegarde's Pantry, Community of Faith Celebrations, Community of Hope, and Feed My Sheep programs. In addition the cathedral is often used for musical events and the cathedral hall has been used for many Civic events over the years.

In 2005 construction began on a new Cathedral Center that opened in early 2007. This space includes the Dean's hall that provides a meeting and dining area for up to 300 people. There are also offices, meeting and other space that serve the cathedral and community that it reaches out to in many ways.

• List of the Episcopal cathedrals of the United States
• List of cathedrals in the United States
• List of the oldest churches in the United States
• Rowland Hall-St. Mark's School

• Official website
• Diocese of Utah
• Historic American Buildings Survey (HABS) No. UT-41, "St. Mark's Episcopal Cathedral, 231 East First South Street, Salt Lake City, Salt Lake County, UT", 16 photos, 9 measured drawings, 31 data pages