||The aim of work: to assess the essential oil compounds found in goldenrod plants (Solidago L.) growing in Lithuania using the gass chromatography-mass spectrometry method. Main tasks: 1. To analyse and subsequently select an optimal method of extraction of essential oils from S. canadensis L. and S. gigantea L. plant material. 2. To perform a qualitative analysis of essential oil compounds in different Solidago L. species growing in Lithuania. 3. To perform a quantitative analysis of identified essential oil compounds in goldenrod (S. canadensis L. and S. gigantea L.) plant material. Methods: The study was performed using leaves and inflorescences of two different species of Solidago L. collected in Lithuania: S. canadensis L. and S. gigantea L. The essential oils, obtained from air-dried plant material by hydrodistillation, were studied by GC–MS. Results and conclusions: The qualitative analysis showed, that the most abundant components of S. canadensis L. and S. gigantea L. essential oil was bornyl acetate, isospathulenol and ent-germacra 4. In the case of S. canadensis L., more components were found to exist in the essential oils extracted from its leaves, rather than inflorescences, while the opposite could be observed with S. gigantea L. specimens. The qualitative study indicated S. canadensis L. leaves collected in Oplankys, Tauragė region in 2017 and S. canadensis L. inflorescences collected in Birbintė, Pagėgiai municipality to contain the largest amount of essential oils according to their total surface area (998,8±0,10 x107 and 708,51±0,79 x107 respectively). The largest ammount of essential oils contained in S. gigantea L. was found to be in specimens collected in Tauragnai, Utena region (131,28±0,26 x 107) and inflorescences collected in Vilkaviškis region, near the village of Klausučiai (290,69±0,38 x 107). Data statistics indicates that according to the total surface area, the amount of essential oils in S. canadensis L. and S. gigantea L. leaves and inflorescences varied dramatically (p<0,05) in all of the specimens. Similarly, the results obtained between the places that the specimens of S. canadensis L. and S. gigantea L. were collected also showed some statistic importance (p<0,05). It could be thus stated that the amount of essential oil depends on the part of the plant used for its extraction, as well as the place of the plants' occurance. By comparing the amount of essential oils in S. canadensis L. and S. gigantea L. according to their total surface area, it was determined that the plant material of S. canadensis L. accumulates a larger amount of essential oils than that of S. gigantea L.. This suggests that in order to extract a larger amount of essential oils, one is recommended to use the plant species of S. canadensis L.