  The polycrystalline samples of LaGa1-xMnxO3 (0<x<0.3) has been prepared by
solid state reaction route. The phase purity of these samples has been
confirmed by powder x-ray diffraction experiments carried out on BL-12 at
Indus-2 synchrotron radiation source. The sample with x=0.2 shows significant
change in the value of capacitance with the application of magnetic field. The
observed results were understood by systematically analyzing
magneto-capacitance (MC), magneto resistance (MR) and dielectric loss as a
function of frequency. Our results and analysis suggests that the observed
magneto dielectric (MD) coupling may be due to the MR effect of Maxwell-Wagner
type and/or field induced dipolar relaxation. Further it is observed that the
oxygen stoichiometry plays a very crucial role in observed MD coupling.
