THREE samples of nano zinc oxide are prepared by using both ……..the hydrothermal and the direct precipitation methods. The characterization of the produced samples shows that the prepared samples have different nano size. Also, it is found that there are an agreement between the calculated values of the particle size from the x-ray diffraction and the TEM measurements. On other hand, the prepared samples are tested as pigments according to the ASTM (1980 and 1981) for comparison with a commercial ZnO. The test showed that the nano sized ZnO exhibits an excellent property when used as pigments relative to the commercial sample.