The polarized IR and Raman spectra of 2-naphthol as a single crystal, in solution and as a KBr pellet or powder, and the inelastic incoherent neutron scattering spectra of the powder were measured and compared with the comesponding naphthalene spectra. The previous assignments of fundamental vibrations were confirmed, except for the in-plane and out-of-plane 0-H bending modes in the crystal. The mediumdependent relative intellsities and frequencies of the vibrational bands are interpreted in terms of the competition between an intramolecular charge transfer interacting with vibrations (vibronic coupling) and hydrogen bonding.