One of the common structures of smart compliant systems is in the form of slender beams, which have the ability of undergoing large deformations due to non-mechanical stimuli. In this study, large deformations of cantilever beams having piezoelectric patches are investigated. The nonlinear kinematics relation of finite beams reported by Reissner (1972) is adopted. The electric field inputs are applied through the thickness of the piezoelectric patches in order to induce curvature changes. Analytical solutions of the governing equations of the deformations of the electro-active beams under actuation of arbitrary number of patches are presented.