The high resolution ro-vibrational spectra of propylene oxide have been recorded for the first time in the C-H stretching region using a rapid scan infrared laser spectrometer equipped with an astigmatic multipass cell. Detailed analyses of the three C-H bands centered at 2942 and 2975 cm(-1) reveal that there are significant perturbations in the methyl C-H symmetric and the two near-degenerate asymmetric fundamental bands. Low resolution Fourier transform infrared spectra of propylene oxide have also been measured with a static gas sample and under supersonic jet conditions. The MP2/6-311++ G(d,p) harmonic and anharmonic frequency calculations have been performed to aid the C-H stretching band assignment. (C) 2010 Elsevier B.V. All rights reserved.