The article is devoted to the historical studies of a princely landownership concentration in Volhyn lands in the 16th century. This landownership was the highest in all the Grand Duchy of Lithuania. According to historical materials, in first third of the 16th century Volhynian princes owned 44% of all landed fund of Volhyn (in correlation with ‘pans’ and ‘zemiane’ landownership; the royal and church was insignificant), in the last third it slightly grew up to 45 %. In the end of century these indexes remained unchanging. In Lutsk district of the Volhynian province a level of concentration of princely landownership was a few other. In last third of the 16th century princes owned 40 % lands, and on the end of century it percent correlation diminished to 38 %. Such calculations are conducted by author on materials of Lutsk deed books, and it allowed to trace and to analyze the specificity of the landed circulation of Volhynian princes in details.