Abstract A visible‐light induced cerium‐catalyzed N ‐demethylation of N ‐methyl amides under air atmosphere to the corresponding of N ‐demethylated amides is presented. Upon irradiation the excited states of [Ce IV Cl n ] 2− are able to activate N ‐methyl amides. This reaction provides a methodology to cleave the C−N bond of amides under air conditions. magnified image