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Second‐harmonic generation was observed in an elastic surface wave propagating in the y direction on the x surface of α‐quartz. The waves were generated and detected by means of interdigital electrode transducers. The fundamental frequency was 9 MHz. The amplitude of the second‐harmonic signal increased linearly with distance along the crystal surface. A nearly perfect square‐law dependence of second‐harmonic power on fundamental power was found. The ratio of second‐harmonic to fundamental power was -43.8 dB at a distance of 2.2 cm and a fundamental input power of 1 W. The results are in quantitative agreement with theory.