Abstract: A one piece fence post cap is disclosed. The fence post cap includes a roof wall and a plurality of side walls formed from a single piece of wood. The side walls are defined by a recess formed in the piece of wood. The recess is shaped to closely receive a top end of a fence post. The recess can be formed by machining the recess into the piece of wood. The fence post cap can be press-fit, nailed, screwed, adhesively, or otherwise secured to the top end of the fence post. The recess can be suitably shaped to receive fence posts of various shapes.