<p>The electrical and thermoelectrical properties along with phase identification, microstructural determination and optical studies are carried out for strontium doped mixed rare earth manganite ceramics. Praseodymium and neodymium in equal ratios are taken as mixed rare elements. The polycrystalline compositions with the general formula Sr_x(PrNd)_1-xMnO₃ (x = 0, 0.25, 0.50, 0.75, 1) synthesized using the conventional solid state reaction technique. X – ray diffraction analysis revealed a structural transformation from the orthorhombic Pbnm phase to the hexagonal P6₃/mmc phase when the Sr content exceeds x = 0.50. High resolution scanning electron microscopy analysis reveals a dense microstructure with varying morphology with increasing concentration of strontium. The average particle size ranges from 0.15 to 0.40 µm for all the compositions. From optical studies, the band gap is found to be in the range of 1.07–1.21 eV. The dielectric properties of Sr_x(PrNd)_1-xMnO₃ are also investigated. Temperature dependent electrical resistivity measurements indicated a decrease in resistivity with rising temperature. While the Seebeck coefficient was large and positive at room temperature for x = 0, with a transition from <i>p</i> – type to <i>n</i> – type conduction at higher temperatures. For other composition, there is <i>n</i> – type behaviour because of negative Seebeck coefficient values. Power factor and figure of merit are greatly affected as the concentration of strontium increases having maximum value for X = 0.75 concentration. Thus, according to the obtained results, the studied materials could be proposed as the most promising materials for thermoelectric applications.</p>