The results of studies of equilibrium melting point and crystallization behavior of PBT/PETG blends are reported for the first time. A single composition-dependent glass-transition temperature is observed in the DSC studies. The isothermal crystallization studies of the blends indicate I retardation in crystallization rate as evidenced by the increase in crystallization half time. The retardation in crystallization rate has been attributed to the miscibility in the molten state :Ind the hindrance to the diffusion of crystallizable units. This assumption is further supported by. the composition dependence of the crystallization half time. A composition-dependent melting point depression hai: been observed which haj been attributed tu the possible thermodynamic and morphological effects. The interaction parameter calculated by analyzing equilibrium melting point depression shows composition-dependent negative values confirming the miscibility of the systems. These results are in good agreement with our earlier results on mechanical anti dynamic mechanical properties of PBT/PETG blends.