Abstract: A dowel pin hole drilling guide for drilling dowel pin guide holes into work pieces, the dowel pin hole drilling guide having a stable piece, the stable piece having adjustable end stop bars rotatably mounted thereto and a movable piece pivotably attached to the stable piece, the movable piece having drill guide passages passing therethrough, the movable piece being adjustable relative to the stable piece and permitting the drilling of dowel pin guide holes in work pieces having compound angled surfaces, the dowel pin drill guide further having stop pin holes passing through the stable piece and stop pins having stop pin heads of various diameters and stop pin stems, the stop pin stems being sized for removable insertion into the stop pin holes and permitting lateral adjustment of the location of dowel pin guide holes to be drilled.