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Self-organized nanopatterns on vicinal N-adsorbed Cu(001) surfaces have been studied by scanning tunneling microscopy. A stripe pattern appears on the Cu(001)-c(2 × 2)N surface vicinal to the 110 direction. The surface consists of 1-nm-wide lines of clean Cu(001) surface and 2-nm-wide c(2 × 2)N lines. There are two stripe domains, in which the Cu lines are parallel or perpendicular to the step edges. On the surface vicinal to the 100 direction, there appears a one-dimensional array of 5×5 nm 2 square patches of c(2 × 2)N surface separated by a 1-nm-wide clean Cu surface.