We have investigated the magnetocaloric properties of Ln0.67Ba0.33Mn1 − xFexO3 (Ln = La or Pr) manganites with x = 0 and 0.05. All compounds present a maximum and large magnetocaloric effect near the Curie temperature (TC). The associated maximum value of the magnetic entropy change, at 5 T applied change in the magnetic field, is 4.37 J.kg− 1.K− 1 for Pr0.67Ba0.33MnO3 manganite with a TC value of 205 K. The corresponding relative cooling power (RCP) reaches 230 J.kg− 1. All the samples present similar RCP values that are relatively high and are promising materials to be used in ecologically friendly magnetic refrigeration technology. Iron doping reduces both TC and ΔSMmax and spreads the temperature working range with an almost constant RCP and can then be used to tune the working conditions of a refrigerator device.