Summary A method is presented for the determination of the frequencyresponse functions of the components of deformation and of stress in orthotropic sandwich plates. It applies to the case of simply supported rectangular plates, loaded by pressure normal to their planes. The analysis takes into account the transverse shear deformation of the core and the material damping of the core and of the facings. The results are presented in the form of expressions suitable for numerical evaluation. An example il­ lustrates the application of this theory.