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In this paper, we consider an application of an iterative decorrelating receiver to direct sequence ultra wideband (DS-UWB) multiple access systems, which utilize biphase modulation. As the number of users increases in the DS-UWB system, multiple access interference becomes a dominant source to degrade system performance. In order to efficiently suppress multiple access interference, a multiuser receiver is required. The high computational complexity of the optimal multiuser receiver prohibits its application. The iterative decorrelating receiver approximates the conventional decorrelating receiver with lower computational complexity. According to the simulation results, the proposed decorrelating receiver clearly improves the system performance. In addition, the convergence characteristics of the proposed iterative decorrelator are investigated in terms of the optimal convergence constant and the error bound.