A universal spring-clip mounting device for attaching an object identifying device, such as RFID tag, bar code label, etc., to one or more objects of interest. Preferably, a device of the present invention is of resilient construction so as to be capable of exerting a retention force on the object of interest. One or more object engaging portions may be provided to engage structure on said object of interest, which may include external structure and/or holes, slots or other apertures thereof. Embodiments of a device of the present invention may be provided with object engaging portions that are designed to engage both substantially horizontally-oriented and substantially vertically-oriented sections of an object of interest, while maintaining substantially the same orientation of an attached object identifying device.