The photocatalytic conversion of biomass-based molecules and its derivatives is a promising strategy to provide eco-friendly synthetic routes of industrial interest. In this work, the selective photooxidation of vanillyl and veratryl to their respective aldehydes by gold nanoparticles (AuNPs) supported on hydrogen titanate nanosupports using visible light and O2 at room temperature and pressure is highlighted. The catalytic results show that the systems are highly active and selective in the photo-oxidation of vanillyl and veratryl alcohol, with conversions above 90% and selectivity above 95% toward the formation of vanillin and veratraldehyde, respectively. Further studies in the presence of scavenger molecules and electron paramagnetic spectroscopy (EPR) allow us to conclude that under visible light the Au NPs generate photoelectrons that move towards the conduction band of the support, where the reduction of O2 occurs to form the superoxide radical anion (O2•-), the main reactive oxygen species causing the oxidation of alcohols.