OH stretching vibrations of hydrogen-bonded cluster ions of phenol (PhOH), [PhOH-(H2O)(n)](+) (n = 1-4), (PhOH)(2)(+), and (PhOH-methanol)(+) have been observed with infrared photodissociation spectroscopy in combination with an ion-trapping technique. Cluster ions were efficiently generated by ionization of phenol followed by a jet expansion and were mass-selectively stored by the radio frequency ion trap method, which allows us to observe infrared multiphoton dissociation yield spectra of size-selected cluster ions. For [PhOH-(H2O)(n)](+), the OH stretching vibrations of the water moieties strongly suggested that the n greater than or equal to 3 cluster ions exhibit the proton-transferred form, [PhO-H3O+(H2O)(n-1)], while the n = 1 and 2 ions are of the nontransferred form, [PhOH(+)-(H2O)(n)]. As for (PhOH)(2)(+), the infrared spectra indicate that the dimer ion is characterized as the open form, in which the phenol ion acts as a proton donor and the neutral phenol as an acceptor through their single hydrogen bond. The similar open form is also found for (PhOH-methanol)(+), in which the phenol ion acts as a proton donor.