The Crystal Cathedral is a Protestant Christian church in the city of Garden Grove, in Orange County, California, United States founded by Robert H. Schuller. The prominent architect Philip Johnson designed the main sanctuary building which seats 2,736. It was constructed using over 10,000 rectangular panes of glass.

The name "Crystal Cathedral" is merely an alliterative colloquialism and does not mean that the church is a cathedral in the sense of being a church where there is a bishop's official seat; the Reformed Church in America is governed by elders. Nor is the church made of crystal. The church is a Southern California architectural landmark.