AbstractDirect C−H trifluoromethylation of arenes and heteroarenes poses an important synthetic challenge that is highly desirable. High‐valent CuIII−CF3compounds have often been invoked in copper‐mediated trifluoromethylation reactions, but the fundamental reactivity toward arenes is elusive. Herein, direct C−H trifluoromethylation of arenes/heteroarenes by a high‐valent CuIII−CF3compound is disclosed for the first time. The CuIII−CF3compound serves CF3radical and a CuIIoxidant by homolytic cleavage of a CuIII−CF3bond, which engage synergistically in a SEAr type reaction with arenes. The presence of K2S2O8co‐oxidant can significantly improve the reaction yields. This reaction shows good efficiency, broad functional group tolerance, and the potential in late‐stage functionalization. The reactivity of high‐valent CuIII−CF3compounds disclosed in this study represents an important progress in organofluorine and CuIIIchemistry.