Neck-thru, Neck-through or neck through body construction is a method of extending the piece of wood used for the neck through the entire length of the body.

This type of neck construction is mainly found on high-end guitars, due to the complexity of the design, making it hard to mass-produce. Neck-thru construction also allows easier access to high frets, because of the non-existence of a heel.

The neck-thru construction is often used by guitar companies such as Rickenbacker, or Gibson on their Thunderbird and Firebird models.