KNbO₃ films have been deposited on STO (SrTiO₃) substrates using MOCVD techniques. The as-grown films are sufficiently piezoelectric to fabricate SAW devices. The experimental results show electromechanical coupling coefficients (K²) of 0.021 at the centre frequency of 960 MHz and λ/h = 0.24 (λ = SAW wavelength, h = KNbO₃ film thickness). These values are in fairly good agreement with theoretical values calculated using the piezoelectric constants of single crystals.