Two new hydrazone compounds, N'-(2-bromobenzylidene)-2-(4-nitrophenoxy)acetohydrazide (1) and N'-(4-nitrobenzylidene)-2-(4-nitrophenoxy)acetohydrazide (2), were prepared and structurally characterized by elemental analysis, IR, UV-Vis and (1)H NMR spectroscopy, and single-crystal X-ray diffraction. Compound 1 crystallizes in the monoclinic space group P2(1)/n with unit cell dimensions of a = 5.3064(5) Å, b = 18.202(2) Å, c = 15.970(2) Å, β = 95.866(3)º, V = 1534.4(2) Å(3), Z = 4, R(1) = 0.0457, and wR(2) = 0.0975. Compound 2 crystallizes in the monoclinic space group P2(1)/c with unit cell dimensions of a = 4.6008(7) Å, b = 14.451(2) Å, c = 23.296(3) Å, β = 93.620(2)º, V = 1545.8(4) Å(3), Z = 4, R(1) = 0.0441, and wR2 = 0.0985. Structures of the compounds are stabilized by hydrogen bonds and π···π interactions. The urease inhibitory activities of the compounds were studied. Both compounds show strong urease inhibitory activities, with IC(50) values of 8.4 and 20.2 μM, respectively.