The　utilization　of　solar　energy　for　the　conversion　of　CO2　into　valuable　organic　products　is　one　of　the　best　solutions　to　solve　the　problems　of　global　warming　and　energy　shortage.　The　development　of　photocatalysts　capable　of　reducing　CO2　under　visible　light,　especially　those　containing　earth-abundant　metals,　is　signi　ficant.　Herein　we　report　that　a　series　of　earth-abundant　Fe-containing　MOFs　(MIL-101(Fe),　MIL-53(Fe),　MIL-88B(Fe))　show　photocatalytic　activity　for　CO2　reduction　to　give　formate　under　visible　light　irradiation.　The　direct　excitation　of　the　Fe-O　clusters　in　these　MOFs　induces　the　electron　transfer　from　O2-　to　Fe3+　to　form　Fe2+,　which　is　responsible　for　the　photocatalytic　CO2　reduction.　Among　the　three　investigated　Fe-based　MOFs,　MIL-101(Fe)　showed　the　best　activity　due　to　the　existence　of　the　coordination　unsaturated　Fe　sites　in　its　structure.　All　three　amine-functionalized　Fe-containing　MOFs　(NH2-MIL-101(Fe),　NH2-MIL-53(Fe)　and　NH2-MIL-88B(Fe))　showed　enhanced　photocatalytic　activity　in　comparison　to　the　unfunctionalized　MOF,　due　to　the　existence　of　dual　excitation　pathways:　i.e.,　excitation　of　an　NH2　functionality　followed　by　an　electron　transfer　to　the　Fe　center　in　addition　to　the　direct　excitation　of　Fe-O　clusters.　(Chemical　Equation　Presented).　©　2014　American　Chemical　Society.