Cathedral of Our Lady of Perpetual Help, Modern Catholic cathedral in Rapid City, United States

The Cathedral of Our Lady of Perpetual Help is a modern Catholic church in Rapid City featuring a rectangular structure with a curved reinforced concrete roof clad in Mankato stone. The building combines contemporary design with traditional religious elements throughout its interior spaces.

The Diocese of Lead, founded in 1902 with St. Patrick's in Lead as its first cathedral, moved its see to Rapid City in 1930, where St. Mary's became the Cathedral of the Immaculate Conception. When the parish outgrew that church and Mass was held in the school gymnasium, Bishop William T. McCarty, C.Ss.R., initiated a new cathedral, built on land given by Katherine Wapole in memory of her husband William. Groundbreaking took place in 1960 and the church was completed in 1962.

The cathedral displays eighteen tall stained glass windows featuring religious figures and an Italian marble altar beneath a large image of Mary. These artistic elements shape the interior and create a space for both private prayer and communal worship.

The cathedral sits at the crest of a hill and is visible from many parts of Rapid City; the rectory stands to its west and the 2019–2024 parish-hall addition to its south. Entry is through three portals under the undulating cantilevered canopy, reached by steps of Cold Spring granite. The 107-foot bell tower rises on the north side.

The 12,000-square-foot addition south of the church, begun in 2019 and finished in 2024, holds a parish hall with classrooms, meeting space and a kitchen; the older social hall is in the cathedral basement. The 1983 pipe organ in the rear gallery cost 100 seats there, and the bell tower carillon went computerized in 2012.