Abstract In this work we present electron paramagnetic resonance (EPR) measurement of double perovskite Ba 2 FeMoO 6 . This type of materials are of great interest due to their simultaneous conducting and ferrimagnetic properties, being them able to use in practical devices for their giant magnetoresistance effect at room temperature The samples have been syntethized with standard ceramic route, with sintering temperature of 1200 °C in a reducing He/H 2 atmosphere. EPR measurements have been carried out in a Bruker spectrometer operating in X band, in the temperature range 80 to 400 K. Below Curie temperature the single line becomes asymmetric, broadens and shifts to lower fields with decreasing temperature. In the paramagnetic region the peak‐to‐peak intensity decreases sharply and the line broadens up to 340 K. The experimental data are compared with similar results of other double perovskites analyzed previously by other authors. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)