In this study, the bulk and surface acoustic waves (BAW and SAW) propagation properties of (K,Na)NbO3 (KNN) films deposited by hydrothermal synthesis or RF magnetron sputtering methods were evaluated to investigate the applicability of such films to high-frequency devices. For the KNN(001)-oriented films deposited by hydrothermal synthesis method, a BAW phase velocity of 6,900 m/s and an electromechanical coupling coefficient k
t
2 of 8.4% were obtained. From the measured Rayleigh-type SAW properties, a large electromechanical coupling coefficient K
2 of 4.0% in the 1st mode was obtained in the KNN(011)-oriented films. On the other hand, for the KNN(001)-oriented films deposited by RF magnetron sputtering, a BAW phase velocity of 7,850 m/s and k
t
2 of 7.4% were obtained. For the 0th mode of the Rayleigh-type SAW, a propagation loss of 0.13 dB/λ (λ: wavelength) at 440 MHz and a temperature coefficient of frequency of –42 ppm/°C were obtained.
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