<p>Photocatalysis is emerging as a promising strategy to address global energy and environmental challenges. This process involves the activation of catalysts by direct light irradiation, which drives chemical reactions on their surfaces. Metal nanoclusters, owing to their nanoscale dimensions and tunable electronic structures, have shown significant potential in photocatalytic applications. In particular, coinage metal nanoclusters (&lt; 2&#xa0;nm) possess discrete energy levels and ultra-small sizes that facilitate efficient charge separation between electrons and holes. Moreover, their electronic structures can be precisely tuned to enhance photocatalytic activity. The well-defined atomic structure and composition of these nanoclusters also make them ideal model systems for investigating photocatalytic mechanisms at the atomic level. In this study, we reviewed recent advances in coinage metal nanocluster-based photocatalysis, focusing on applications such as amine oxidation, degradation of organic pollutants, and hydrogen production via water splitting. We further discuss strategies to enhance their photocatalytic performance and explore their future development prospects.&#xa0;</p> Graphical abstract <p></p>