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Wireless networks are no more used for transfer of only voice but now also support data, video and multimedia. The key issue is to provide these services and maintain quality of service (QoS) in hybrid wireless networks. A very interesting problem is managing radio resources in a hybrid wireless network. The paper presents an agent-based scheme for efficient management of radio resources in hybrid wireless networks. Performance of the proposed scheme is measured in terms of successful handover rate between different wireless network architectures (e.g., WLAN, cellular), and also by the allocated bandwidth to admitted calls. Simulation results show that the proposed agent-based approach provides a 10% increase in the average allocated bandwidth obtained with conventional resource management schemes.