Orthodox Presbyterian is a denomination that broke away from the liberal northern branch of the Presbyterian church in the early 1930s.
It is Presbyterian by polity and doctrine. That is it adheres to the Westminster Confession and the Shorter and Larger Catechisms.
Thanks. I know that we have one here. Got to visit with the pastor back a few years ago — really nice guy, and his church permitted a report from The Gideons International local camp.