Abstract—In the first part of this review (Biophysics, 63, 858 (2018)), the structure of H1 family linker histones, their posttranslational modifications, as well as the role of H1 histone in the formation of compact transcriptionally inactive chromatin, were considered. The second part is devoted to the role of H1 family linker histones in the structural organization of chromatin at different levels: from nucleosomes to metaphase chromosomes. The mechanisms of interaction of H1 histone with other elements of chromatin, including with DNA and nuclear proteins, are discussed.