A modular utility truck bed has a deck assembly comprising a center section, a right side section, and a left side section. The right and left side sections are bolted to the sides of the center section to form a substantially planar deck. A tail piece extends across a rear end of the deck assembly. The tail piece is bolted to rear ends of each of the center and side sections of the deck assembly. A front rack extends across a front end of the deck assembly. The front rack is bolted to front ends of each of the center and side sections of the deck assembly. The deck assembly, tail piece and front rack are modular components that can be shipped disassembled in a compact configuration and bolted together by the end user.