We have investigated the magnetocaloric effect in single and polycrystalline samples of quantum paraelectric EuTi O 3 by magnetization and heat capacity measurements. Single crystalline EuTi O 3 shows antiferromagnetic ordering due to E u 2+ magnetic moments below T N= 5.6 K. This compound shows a giant magnetocaloric effect around its Néel temperature. The isothermal magnetic entropy change is 49 J kg− 1 K− 1, the adiabatic temperature change is 21 K, and the refrigeration capacity is 500 J kg− 1 for a field change of 7 T at T N. The single crystal and polycrystalline samples show similar values of the magnetic entropy and adiabatic temperature changes. The large magnetocaloric effect is due to suppression of the spin entropy associated with the localized 4 f moment of E u 2+ ions. The giant magnetocaloric effect, together with negligible hysteresis, suggest that EuTi O 3 could be a potential material …