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Superconductivity at interfaces has been investigated since the first demonstration of electric-field-tunable superconductivity in ultrathin films in 1960¹. So far, research on interface superconductivity has focused on materials that are known to be superconductors in bulk^,,,,,,,,. Here, we show that electrostatic carrier doping can induce superconductivity in KTaO₃, a material in which superconductivity has not been observed before^,. Taking advantage of the large capacitance of the self-organized electric double layer that forms at the interface between an ionic liquid and KTaO₃ (ref. ), we achieve a charge carrier density that is an order of magnitude larger than the density that can be achieved with conventional chemical doping. Superconductivity emerges in KTaO₃ at 50 mK for two-dimensional carrier densities in the range 2.3 × 10¹⁴ to 3.7 × 10¹⁴ cm⁻². The present result clearly shows that electrostatic carrier doping …