Here are some of the largest Christian publishing companies:
HarperCollins Christian Publishing: This division of HarperCollins Publishers includes imprints such as Thomas Nelson, Zondervan, and HarperBibles, and publishes a wide range of Christian books including Bibles, fiction, nonfiction, and children's books.
Tyndale House Publishers: A publisher of Christian fiction and nonfiction, including the popular Left Behind series and other works by authors such as Francine Rivers and John Piper.
Baker Publishing Group: A Christian publisher that produces books in a variety of genres, including fiction, nonfiction, theology, and Christian living.
Crossway: A non-profit publisher of Christian books, including the English Standard Version of the Bible and works by theologians and pastors such as John Piper and Tim Keller.
Focus on the Family: A Christian organization that publishes books, magazines, and other resources on topics such as marriage, parenting, and personal growth.
LifeWay Christian Resources: A subsidiary of the Southern Baptist Convention, LifeWay publishes Bibles, Christian books, and other resources for churches and individuals.
InterVarsity Press: A Christian publisher that focuses on theology, biblical studies, and Christian living, and also publishes academic books in these areas.
W Publishing Group: A division of Thomas Nelson which focus on Christian fiction and non-fiction, biblical studies, theology and Christian life books.