Calvary Boys Ranch is a Christian boys' boarding-school ministry associated with Calvary Baptist Church near Eufaula, Oklahoma. The church's public history says Calvary Baptist Church began in 1977 in Canadian, Oklahoma, and moved after 102 acres of wooded land north of Eufaula were donated in 1984.

Public online information about the ranch is limited. The church website refers to the property and ministry at Eufaula, while youth-program advocacy directories have listed the boys' ranch under the Calvary name. A 2025 federal-court opinion in Arkansas described Calvary Baptist Ministries' Boys Ranch as a Christian boarding school for boys in Oklahoma.

The spelling of the ranch's name appears inconsistently in some advocacy listings, but the church and court materials use "Calvary." Major public sources include the Calvary Baptist Church website and the federal-court opinion in McCarthy v. Calvary Baptist Ministries, Inc..