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In multiple-relay cooperative wireless networks, opportunistic relaying is a promising scheme, where the most challenging problem is to choose the best relay efficiently. The traditional opportunistic relay selection scheme is based on the channel conditions of source-relay (S-R) and relay-destination (R-D) links. In comparison with conventional narrowband networks, an appealing merit of impulse radio based ultra-wideband (IR-UWB) networks is their inherent ranging/positioning ability. In this paper, we focus on IR-UWB cooperative networks and propose a distributed opportunistic relay selection algorithm based on the distance information of S-R and R-D links. Simulation results reveal that good performance can be achieved by using our proposed scheme.