Peep hole security systems and methods are provided including a threaded optical shaft having a bezel with a security pin extending from an interior surface of the bezel and a threaded interlocking cylinder including an interior flange. An optical shaft hole in a door receives the threaded optical shaft and a security pin hole in the door receives the security pin. The threaded optical shaft is then engaged with the threaded interlocking cylinder until the interior surface of the bezel contact the exterior surface of the door and the interior flange of the threaded interlocking cylinder contacts the interior surface of the door. Attempts to rotate the threaded optical shaft are prevented by the engagement of the security pin with the door.