Abstract: A nail gun siding installation guide is provided having a body with a top, a bottom, a first side, a second side, a front face, a rear face, and a circular opening. On the top of the body, a spacing ridge protrudes outwardly from the front face. On the rear face and top of the body an alignment mark allows the operator to quickly identify where the fastener will be driven relative to the body. The bottom front face of the body is beveled to provide ease of use of the nail gun siding installation guide. The first side and the second side may be flared outwardly from the bottom towards the top of the nail gun siding installation guide or may be parallel to each other as when the nail gun siding installation guide is viewed from the front or back. The circular foot of the fastener driving tool is received in and through, and cooperates with the circular opening of body of the nail gun siding installation guide.