Abstract: A modular fence assembly including a pair of vertical posts positioned at suitable distance and adapted to be secured to a suitable support surface. At least one horizontal upper and lower rails extend between and secured to the vertical posts. The horizontal upper rail has a plurality of vertical apertures which are substantially aligned with a plurality of vertical apertures on the horizontal lower rail. A plurality of pickets are respectively inserted through the vertical apertures of the upper rail and through aligned vertical apertures of the lower rail. Each picket has at least two transverse locking slotted apertures for respectively receiving a H-shaped locking clip to secure the picket to the rail and preventing vertical movement of the pickets with respect to the rails.