The　chaotic　dynamics　of　parametrically　excited,　simply　supported　laminated　composite　piezoelectric　rectangular　plates　are　analyzed,　The　plates　are　forced　by　transverse　loads.　It　is　assumed　that　different　layers　are　perfectly　bonded　to　each　other　with　piezoelectric　actuator　patches　embedded　in　them.　Firstly,　based　on　von　Karman-type　equations　and　third-order　shear　deformation　laminate　theory　of　Reddy,　the　nonlinear　equations　of　motions　of　the　laminated　composite　piezoelectric　rectangular　plates　are　derived.　Here,　we　consider　the　piezoelectric　parametric　loads　and　in-plane　parametric　loads　acting　in　both　x-direction　and　y-direction.　Then,　the　Galerkin＇s　approach　is　applied　to　convert　partial　differential　equations　to　the　ordinary　differential　equations.　The　method　of　multiple　scales　is　used　to　obtain　the　averaged　equations.　Finally,　based　on　the　averaged　equations,　periodic　and　chaotic　motions　of　the　plates　are　found　by　using　numerical　simulation.　The　numerical　results　show　the　existence　of　periodic　and　chaotic　motions　in　averaged　equations.　The　chaotic　responses　are　sensitive　to　initial　conditions　especially　to　forcing　loads　and　the　parametric　excitation.　Copyright　©　2007　by　ASME.