Transparent conducting oxide thin films doped with transition metals have attracted intense research interest following theoretical predictions of possible room temperature ferromagnetism in these films. This monograph details the growth, characterization and thermopower studies of room temperature ferromagnetic Mn doped indium oxide and indium tin oxide thin films grown by dc reactive sputtering and the influence of annealing on the properties of the films. Details of the experimental setups for measurement of thermopower using integral and differential methods and the fabrication and performance studies of transparent thin film thermocouples also form content of this monograph.