Jennings Ligon Duncan III is an American Presbyterian scholar and pastor. He is Chancellor of Reformed Theological Seminary.

Covenant Theological Seminary, informally called Covenant Seminary, is the denominational seminary of the Presbyterian Church in America (PCA). Located in Creve Coeur, Missouri, it trains people to work as leaders in church positions and elsewhere, especially as pastors, missionaries, and counselors. It does not require all students to be members of the PCA, but it is bound to promote the teachings of its denomination. Faculty must subscribe to the system of biblical doctrine outlined in the Westminster Standards.