The Neck Joint (nɛ́k ǰɔ̀ynt) is where the neck is either bolted or glued onto the body of the guitar. There are several different types of neck joints that are used in the construction of guitars. The Spanish Heel type of neck joint is a headblock and neck that is carved from a single piece of wood. Mortise and Tenon neck joints are two examples that have a peg on the end of the neck that is fastened into a cavity on the body. Dovetail neck joints use a triangular shaped peg that is inserted into a recess of the same shape. Bolt-on neck joints are just what the name implies, the neck is held onto the body by a bolt.

Also, not all guitars have a neck joint. Some guitars are constructed from a single, solid piece of wood where the neck and body do not need to be joined by other means.