It is known that humpbacked salmon populations breeding in the rivers of the northern coast of the Sea of Okhotsk, as well as on the Kamchatka Peninsula, have remained unaffected by mass morphological studies using numerous external morphology parameters. The goal of the study was to quantitatively assess the morphological diversity and magnitude of differentiation of humpbacked salmon populations spawning in some rivers of the northern coast of the Sea of Okhotsk and the eastern and western coasts of the Kamchatka Peninsula. The morphological diversity of humpbacked salmon populations of the Ola, Bolshaya, and Zhupanova rivers of adjacent even generations was studied. To quantitatively describe the appearance of humpbacked salmon, we used a scheme of 17 surveys proposed by M.K. Glubokovsky [3]. On average, lower values of morphological diversity are typical for head measures and fin heights, while measures of body length and height have high morphological diversity. The hierarchical method of morphological diversity decomposition provides an insight into the proportions of intra- and interpopulation variability included in the total value of morphological diversity of each survey. For females, the mean proportions of morphological diversity for all surveys are as follows: sample - 48%, intra-annual - 19%, and inter-population - 33%; for males, sample - 47%, intraannual - 17%, and inter-population - 36% of the proportion. Thus, almost half of the total value of morphological diversity is determined by differences in morphological surveys between individuals within the sample, interpopulation differences account for one-third of the total value, and the interannual proportion in the indicator of morphological differences is quite small. The sufficiently high interpopulation proportion of morphological diversity indicates the possibility of using morphological surveys to distinguish populations from different parts of the range.