The purpose of the study is to identify the features of ethno-demographic processes in Crimea during the first two decades of the 21st century. The work is based on statistical and cartographic research methods. The nature of ethno-demographic processes in the territory of Crimea in the period between the population censuses of 2001 and 2021, which saw a change in the political subjectivity of the peninsula, was determined by the growth in the number and share of the Russian and Crimean Tatar population. At the same time, there was a significant reduction in the size and proportion of the Ukrainian population, caused by both migration outflow and a change in ethnic identity. In addition, the study was able to identify an important spatiotemporal component of ethnodemographic processes in Crimea during this period – the increasing concentration of the main ethnic communities (Russians, Ukrainians and Crimean Tatars) in the southern part of the peninsula.