A visible-light-driven iron-catalyzed C(sp3)–Hamination of diphenylmethane derivatives with 1,2,3,4-tetrazoles under mild conditions has been developed. The reaction proceeds with photosensitizer-free conditions and features satisfactory to good yields. Mechanistic studies revealed that the reaction proceeded via an iron–nitrene intermediate, and H atom abstraction was the rate-determining step. Computational