A Pd/C catalyzed reductive carbonylation of nitroarenes for the synthesis of unsymmetricalureas has been developed. Using inexpensive and stable nitroarenes as the substrates, a series of unsymmetricalureas were produced in moderate to good yields. A range of functional groups including thioethers, halides and vinyl were compatible with this reaction. As a heterogeneous catalyst, Pd/C was recycled