The perovskite oxides CaMnO 3 , SrTiO 3 and BaSnO 3 are among the most well-studied n-type candidates, but their thermoelectric performance currently lags behind their p-type counterparts. For CaMnO 3 , W doping led to a peak ZT of 0.15 at 973 K, while co-doped Ca 0.96 Dy 0.2 Yb 0.2 MnO 3 exhibited a maximum ZT of 0.2 at the same temperature. Nb-and La-doped SrTiO 3 achieved a maximum ZT of 0.37 at 973 K, while co-doping with both Nb and La pushed the peak ZT to over 0.6 at 1100 K. The transparent conducting oxide BaSnO 3 has a much higher predicted peak ZT of 2.16 at 1700 K, but the predicted ZT at a more reasonable and comparable temperature of 1000 K is only 0.62. Mg 2 (Sb, Bi) 3 is the only mixed-anion n-type thermoelectric to have been discovered so far, most likely due to the lack of research into mixed anion systems. Nevertheless, such compounds lend themselves well to the phonon-glass, electron-crystal school of thought, as anions of different size would be expected to scatter phonons, leading to naturally low lattice thermal conductivity, which makes such systems a promising avenue of research.