Abstract: A modular rail and post fence system which may be fabricated, assembled, and installed without fasteners, adhesives or welding. The fence system includes a plurality of rail assemblies with each rail assembly formed from a pair of panels. Each panel has a pair of sidewalls joined together at an angle to form an angled edge wherein the pair of panels are joined together to form a rail assembly. A plurality of elongated posts are also provided. Each elongated post has at least one longitudinal recess. At least one pair of notches in the pair of longitudinal recesses is provided whereby the angled edges of each rail assembly are received in one pair of notches of the elongated posts.