tNH2-MIL-125(Ti), an amine-functionalized metal-organic-framework (MOF), was found for the first time to exhibit photocatalytic activity for the aerobic selective oxidation of amines to imines under visiblelight irradiations. Different amines can be effectively transformed to imines using O2over NH2-MIL-125(Ti) under visible light irradiations. The photo-generated Ti3+and.O2−which was formed via thereaction between Ti3+and O2, are proposed to be involved in this transformation process based on theexperimental observations and the ESR result. This work provides an economical, sustainable and greenprocess for amines transformations and highlights the great potential of MOFs as photocatalysts fororganic syntheses