Abstract: Mg-1.5Ca and Mg-3.0Ca alloys have been successfully synthesized using argon arc melting method. SEM and XRD were used to analyse the microstructure of the alloys. Creep resistance of the Mg-Ca alloys were investigated using impression creep technique at 423-523 K under constant stress of 357 MPa. Creep resistance for the Mg alloy enhanced with addition of Ca. Activation energies were calculated and found to be 142.5 and 108.4 kJ mol–1 for Mg-1.5Ca and Mg-3.0Ca samples, respectively. Microstructures in both alloys showed eutectic mixtures containing fine Mg2Ca and α-Mg phases at both interdendritic and inter-grain regions.