Abstract: A toolbox mounting bracket for a pickup truck for securing a toolbox in the box of a pickup truck without having to drill holes in the side wall. The toolbox mounting bracket for a pickup truck includes a bracket member including a plate-like member having a front side and a back side and also including a support member being securely attached to the front side of the plate-like member and extending outwardly therefrom; and also includes a truck box fastening member being fastenably threaded through the support member and being adapted to fasten to a truck box for securing the bracket member to the truck box; and further includes a toolbox clamping member being threaded through the support member and being adapted to engage a portion of a toolbox between the toolbox clamping member and the truck box.