Abstract: A sliding tray assembly is disclosed comprising a pair of spaced support rails which are interconnected by means of a connecting bar and which can be easily secured to a pair of spaced, substantially upright legs of a walker or other like object. The tray assembly itself is attached to the legs so as to extend forwardly thereof in order to prevent the tray assembly form obstructing the use of the object. The tray assembly further includes a pair of guide rail members which are respectively secured to the spaced support rails. The guide rails define guide channels within which a tray is removably, slidably mounted. The tray can be selectively secure within the channels along the length of the guide rails to position the tray in various operating positions.