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We evaluated the electrochemical performances of LaNiFeO (LNFO) and LaNiCoO (LNCO) perovskites as cathodes in LaSrGaMgO (LSGM) electrolyte-supported solid oxide fuel cell. Both samples show excellent chemical compatibility with the LSGM electrolyte up to 900 °C, and exhibit small-polaron type electrical conduction with a high conductivity σ ≈ 510 (430) S·cm at 800 °C and a small activation energy E = 54.9 (44.4) meV for LNFO (LNCO). The oxygen-reduction reaction evaluated in a symmetric LNFO(LNCO)|LSGM|LNFO(LNCO) cell gives a polarization resistance R ≈ 0.51 (0.34) Ω·cm at 800 °C in air and an activation energy E = 1.61 (1.87) eV. For a single cell composed of LNFO (LNCO) cathode, 300-μm-thick LSGM electrolyte, and a composite Ni + Gd-doped ceria anode, the maximum power densities reach P = 490 (650) and 850 (1015) mW·cm at 800 and 850 °C, respectively. These results demonstrated that LNFO and LNCO are promising cathode materials for the IT-SOFCs., This work was supported by the National Science Foundation of China (Grant No. 51402019, 51573021) and Beijing Natural Science Foundation (Grant No. 2152011). HQL is supported by the project about the promotion of innovation in Beijing universities funded by Beijing Municipal commission of education of China (Grant No. TJSHG201510017024). JAA grateful acknowledges the Spanish MINECO for granting the project MAT2013-41099-R. JBG was supported by the Robert A. Welch Foundation, Houston, TX (Grant No. F-1066).