Cathedral of Saint John the Baptist, Roman Catholic cathedral in downtown Charleston, United States.

The Cathedral of Saint John the Baptist is a Gothic Revival brownstone structure in downtown Charleston with tall spires, bronze crosses, and marble arches throughout. Intricate stained glass windows depicting biblical scenes are placed at intervals along the interior walls.

The original building was destroyed during the 1861 Charleston fire, prompting architect Patrick Keely to design a replacement that opened in 1907. This reconstruction was part of Charleston's recovery following the Civil War.

The stained glass was made by Franz Mayer & Co. of Munich. The lower nave has 14 two-light windows of Christ's life; the upper nave's Gallery of the Saints shows 28 saints, and the clerestory depicts the four evangelists. Above the high altar, a rose window shows John the Baptist baptizing Jesus, ringed by eight angels playing instruments.

The upper church seats 720 worshippers, while the Our Lady of Grace Chapel in the lower church holds 200 and serves overflow crowds at mass. The 2010 spire has open grill work that lets air pass through, reducing wind load. Look up at the belfry's copper louvers and the brown cast stone pinnacles at each corner of the arches.

Below the cathedral lies a crypt holding the remains of Bishop England and four other bishops from Charleston's past. Many visitors overlook this underground chamber during their visit.