An analysis of Ni II based on 4300 observed lines is presented. The low structures are 3d9, 3d8 4s and 3d7 4s2 which are now complete except for 3d8(1S)4s2S and 3d7 4s2 2P½ and the higher of the two 2D terms of 3d7 4s2. Long series occur such as 3d84s to 9s, 4d to 8d, 4f to 7f, 5g to 7g. The analysis also includes many terms of the complex structure 3d7 4s 4p but only 55 percent of the levels within reach of the hollow cathode source have been found. The identification of the levels of 3d8 4d and 5d was assisted by the calculations of N. Spector. The 4d7 4s2 levels were calculated by Y. Shadmi, who also provided calculated positions for all the levels of 3d7 4s 4p without which much of the analysis would have been impossible. The 3d8 ns and 3d8 nd series give a limit of 146532.0 but the 3d8 ng series gives 146541.56. The latter has been adopted though no explanation of the discrepancy has been found.