Mobility plays an important role in performance of MANET. Therefore, mobility models are used in almost ad hoc networks, and it should represent realistic scenarios with MANETs, since MANETs are affected by every node movements and by network topologies. IEEE 802.11 is a set of standards for implementing wireless local area network (WLAN), these standards provide the basis for wireless network products using the Wi-Fi band which may be used in MANETs. This paper aims to study the impact of most famous mobility models such as Reference Point Group Mobility, Random Waypoint Mobility, Freeway Mobility and City Section Mobility on the performance of IEEE 802.11 through simulation, and measurements used are throughput, overhead, end-to-end delay, packet dropped and packet delivery ratio parameters, using NS2.34.