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The resource allocation problem in wireless multi-user decode-and-forward (DF) relay networks is considered. The conventional resource allocation schemes based on the equal distribution of bandwidth and/or power may not be efficient for the networks with constrained/limited power and bandwidth resources at both sources and relays. Therefore, joint bandwidth and power allocation schemes are proposed based on (i) the maximization of the sum capacity of all users (source-destination pairs); (ii) the maximization of the worst user capacity; (iii) the minimization of the total power consumptions for all users. It is shown that the proposed problem formulations can be transformed to equivalent convex optimization problems. Therefore, the joint bandwidth and power allocation problems can be efficiently solved. The performance improvements offered by the proposed schemes are demonstrated by simulations.