A camera mounting assembly including a mounting bar and an adapter plate for mounting a security camera or an electrical fixture to an electrical box installed in a wall or ceiling. An elongated base portion on the mounting bar is adapted to mount to the face of a conventional electrical box and extend beyond the walls of the box. A pair of prongs extends from the base portion of the mounting bar and at least one aperture is provided on the end of the bar. The adapter plate includes an opening with an inner periphery and an inclined surface adapted for twist locking engagement with the prongs of the mounting bar. The camera mounting assembly enables the mounting of a wide range of conventional security camera housings or electrical fixtures to a conventional electrical box.