Accurate hydrogen-bond dissociation energies were determined for gas-phase hydrogen-bonded complexes between 1-naphthol or 1-naphthol-d 3 and H 2 O, CH 3 OH, NH 3 and ND 3 , using the stimulated emission pumping-resonant two-photon ionization spectroscopy technique in supersonic jets. The hydrogen-bond dissociation energies obtained for the electronic ground state are D 0 = 2035 ± 69 cm - 1 for 1-naphthol H 2 O, 2645 ± 136 cm - 1 for 1-naphthol CH 3 OH, 2680 ± 5 cm - 1 for 1-naphthol NH 3 and 2801 ± 14 cm - 1 for 1-naphthol-d 3 ND 3 , respectively. Upon electronic excitation to the S 1 state the binding energies increase by approximately 8%.