Abstract: A universal circuit module mounting structure is characterized by mounting hardware for a circuit module which enables the same to be mounted either between a pair of spaced channels or within circuit card guides. For mounting between the channels, L-shaped brackets are removably fastened to upper and lower ends of the module, upstanding legs of the brackets are apertured, the apertures are aligned with passages through the channels and fasteners extended through the apertures and passages secure the module to and between the channels. To mount the module within circuit card guides, generally U-shaped brackets are removably fastened to the module upper and lower ends, and outwardly extending legs of the brackets are slid within the card guides to mount the module therewithin.