Herein, we describe an intramolecular reductive aminocarbonylation of haloaryl-tethered nitroarenes with carbon monoxide to access dibenzazepine-based heterocycles. The use of a nickel catalyst and manganese reductant allows the expedient synthesis of structurally diverse dibenzoxazepinones, dibenzothiazepinones, and dibenzodiazepinones, obviating the in-advance transformation of the nitroarene moiety to aniline in a conventional aminocarbonylation process.