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Cosintering (La0.84Sr0.16MnO3 thin‐film cathode/ZrO2: 8 mol% Y2O3 thin‐film solid electrolyte/55 vol.% ZrO2:8 mol% Y2O3 + 45 vol.% NiO anode, ϕ = 12 × 1.5 mm thick pellet) was achieved by applying an electric field for 5 min at 1200°C. Impedance spectroscopy measurements of the anode‐supported three‐layer cell show an improvement of the electrical conductivity in comparison to that of a conventionally sintered cell. The scanning electron microscopy images of the cross‐sections of electric field‐assisted pressureless sintered cells show a fairly dense electrolyte and porous anode and cathode. Joule heating, resulting from the electric current due to the application of the AC electric field, is suggested as responsible for sintering. Dilatometric shrinkage curves, electric voltage and current profiles, impedance spectroscopy diagrams, and scanning electron microscopy micrographs show how anode‐electrolyte‐cathode ceramic cells can be cosintered at temperatures lower than the usually required. [ABSTRACT FROM AUTHOR]