Calvary Chapel Costa Mesa is a Christian megachurch located in Costa Mesa, California, founded in 1965 by Pastor Chuck Smith. It started with a small group of 25 people and has grown into the "mother church" of an international network of over 1,700 churches, with around 9,500 attendees at its main location each week.

The church is known for its non-denominational and contemporary approach to worship, welcoming individuals from diverse backgrounds. It emphasizes expositional teaching of the Bible, delivering sermons verse-by-verse to help congregants gain a deeper understanding of Scripture. Calvary Chapel Costa Mesa also engages in community outreach, focusing on spiritual growth and support for marginalized groups. As a central hub for a global fellowship of churches, it provides resources and training to affiliated congregations worldwide.