Calvary Chapel Costa Mesa is a Christian megachurch located near the boundary between the cities of Costa Mesa and Santa Ana in Orange County. It is the original Calvary Chapel, having grown since 1965 from a handful of people led by the original senior pastor Chuck Smith to become the "mother church" of over one thousand congregations worldwide. Outreach Magazine's list of the 100 Largest Churches in America lists attendance as 9,500, making it the thirty-ninth largest in America.