Abstract: The study was carried out numerically to study to investigate casson fluid effects on magneto-hydrodynamics (MHD) unsteady heat and mass transfer free convective past an infinite vertical plate. Appropriate dimensional quantities were applied to change the dimensional governing coupled non-linear partial differential equations to non-dimensional form. Numerical solution of the dimensionless governing coupled boundary layer partial differential equations were obtained using finite element method (FEM). The expressions of velocity, temperature, concentration, skin friction, Nusselt number as well as Sherwood number have been obtained and discussed using line graph.