In this paper, the buckling analysis of simply supported thin shallow spherical shells made of functionally graded material (FGM) is studied using the first order shear deformation theory (FSDT).The equilibrium equations are derived by minimization of the total potential energy functional. The Galerkin method is employed to solve the derived equations. Since the employed strain-displacement relations are nonlinear, so the presented analysis is nonlinear with high accuracy. The obtained results are compared and validated with the results existed in the literature. The effects of some significant geometrical and mechanical parameters on the buckling load are studied and discussed. It is observed that when the power law index increases, the critical buckling hydrostatic pressure of the FGM shallow spherical shell decreases.
