The repository data for "Hybridization of multiple vibrational modes via strong coupling using confined light fields" by Menghranjani et al. (Advanced Optical Materials, 2019) are, figure2.txt For figure 2, three files are merged here file 2.1 shows experimentall transmission data of 2 um PMMA, file 2.2 computationally calcualted empty cavity and, file 2.3 shows transmission data ofexperimentally filled cavity at angle 0. figure3.txt For figure 3, again, data files are merged For Figure 3a, file 3.1 shows computationally caclulated transmission spectra of pmma filled cavity for 70' angles. For figure 3b, file 3.2 shows experimentally determined transmission spectra of pmma filled cavity for 70' angles. figure4.txt For figure 4, again, data files are merged For Figure 4a, file 4.1 shows data points of computationally caclulated empty cavity mode. For figure 4b, file 4.2 shows experimentally calculated transmission spectra of different bands. figure5.txt For figure 5, again, data files are merged For Figure 5a, file 3.1 shows computationally caclulated transmission spectra of pmma on grating strcture for 30' angles. For figure 5b, file 3.2 shows experimentally calculated transmission spectra of pmma on grating strcture for 30' angles. figure6.txt For figure 6, again, data files are merged For Figure 6a, file 6.1 shows data points of computationally caclulated grating mode without oscillation strength. For figure 6b, file 6.2 shows experimentally calculated transmission spectra of different bands.