Abstract: A modular truck bed divider system includes a plurality of modular dividers and a plurality of fasteners. The modular divider has a first leg and a second leg which is substantially perpendicular to the first leg. A plurality of openings are formed along the length of the first and second legs. The cross section of the modular divider is preferably the shape of a channel. To install the modular truck bed divider system, a plurality of modular dividers are arranged in a pick-up truck bed in such a fashion that they form a particular set of compartments. Once the compartment configuration is decided upon, the plurality of modular dividers are attached to each other with the plurality of fasteners.