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The galaxy cluster system Abell 1689 has been well studied and yields goodlensing and X-ray gas data. Modified gravity (MOG) is applied to the clusterAbell 1689 and the acceleration data is well fitted without assuming darkmatter. Newtonian dynamics and Modified Newtonian dynamics (MOND) are shown notto fit the acceleration data, while a dark matter model based on theNavarro-Frenk-White (NFW) mass profile is shown to fit the acceleration datafor the radial range $r > 200$ kpc.

Modified gravity (MOG) and the cluster Abell 1689 acceleration data