The paper presents a part of the forest entomology inventory and pest monitoring results during the 3-year research period (2007-2009), conducted within the National park 'Đerdap', North-East Serbia. A classical approach standardized for the Macrolepidoptera monitoring programs was applied. Several light trap models were used, as well as Malaise traps. Moths were also collected directly, on street lights, flowers and with wine baited traps. Species abundance, frequency of appearance and corresponding flight periods was obtained with the negligible impact to the fauna, complying to the standards prescribed in the areas of protected nature. Taxonomical identification of the recorded noctuid moths was done according to most relevant and recognized keys, listed in the references. In total, 48 species of potentially harmful Noctuidae species were recorded during the 3-year inventory. By the starting assumption, their harmfulness was derived from the former literature data, as well as rich forest protection, defoliator outbreak history and field experience of local forestry. Out of 286 noctuids known for the area of Đerdap, only the listed 48 (Table 1) were chosen for the purpose of this paper. For all the listed species, place and date of the first record is given, their flight period, food plant and observed frequency (given as number of specimens in various number classes - Table 1). It is concluded that, during the monitoring period none of the recorded species caused damages that could be categorized as harmful for the tree species of their corresponding food plants.