Interaction of waves with a group of vertical cylinders is investigated. The inter-scattering of the waves from various cylinders is taken into consideration in the analysis. A direct solution is obtained through a matrix inversion. The forces on a cylinder due to linear waves in the presence of other cylinders are evaluated. This method may be applied to design large multilegged offshore platforms where drag effects are negligible. The theory has received some experimental verification. Numerical results are also presented for various platform configurations to show the effect of the presence of the neighborhood cylinders on the wave forces on a vertical cylinder. The results are compared with the single cylinder solution.