ENAll the royal economies of the Grand Duchy of Lithuania had forests in the second half of the seventeenth century. However, only the most valuable ones were organised into forest districts. They were located mainly in the economy of Grodno and included the following forest districts: Białowieski, Sokólski, Nowodworski, Perstuński, and Przełomski. The article describes the duties of hunting and forestry services: foresters, beaters, shooters, hunters, and beaver masters. The study has been based on the inventories and inspections made in the second half of the seventeenth century as well as the royal ordinance for the royal forests of the Grand Duchy of Lithuania issued during the reign of King Władysław IV Vasa. Considerable attention was paid to contracts for forest products which served to administer the exploitation of forest resources. In addition to numerous privileges for contractors, the agreements also included provisions on protecting primaeval forests and game against their destruction. Sustainable forest management was carried out in these primaeval forests, which the Polish kings considered valuable. Numerous encroachments into forests by the nobility hampered its proper implementation. For this reason, attempts were made to exchange some territories that made forest management particularly difficult. Over time, the Lithuanian forest management model based on forest districts was adapted to the Polish conditions.