Abstract: A sliding panel lock for locking sliding panels such as windows or patio doors slidably coupled to a frame in which the top edge of the frame is captured within an inverted U-shaped channel consisting of a wedge member having a top edge dimensioned for abutting the top inside surface of the channel and a clamp member for clamping the wedge member in position, the wedge member having an inclined bottom surface for wedging against the corner of the sliding panel and extending between the top surface of the sliding panel frame and the bottom surface of the channel into which the frame of the panel member is received, thereby preventing the sliding of the panel toward the wedge member and the lifting of the panel out of the bottom channel.