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A R a n k in e P a n e l M e th o d fo r A d d ed R e s is ta n c e of S h ip s in W a v e sA new Rankine panel method and an extended Reynolds-Averaged Navier-Stokes (RANS) solver were employed to predict added resistance in head waves at different Froude num bers o f a Wigley hull, a large tanker, and a modern containership. The frequency domain panel method, using Rankine sources as basic flow potentials, accounts for the interac tion o f the linear periodic wave-induced flow with the nonlinear steady flow caused by the ship's forward speed in calm water, including nonlinear free surface conditions and dynamic squat. Added resistance in waves is obtained by the pressure integration method. The time domain RANS solver, based on a finite volume method, is extended to solve the nonlinear equations of the rigid body six-degrees-of-freedom ship motions. The favorable comparison o f the panel and RANS predictions demonstrated that the Rankine method is suitable to efficiently obtain reliable predictions of added resistance o f ships in waves. Comparable model test predictions correlated less favorably, although the overall agree ment was felt to be acceptable, considering the difficulties associated with the procedures to obtain accurate measurements.