The objective of the study was to determine the antioxidant activity and the content of anthocyanins in some selected plum cultivars (Prunus domestica) grown in Poland. The following cultivars constituted an experimental material used in the study: ‘Bluefre’, ‘Čačanska Najbolja’, ‘Węgierka Dąbrowicka’, ‘Stanley’, ‘Valjevka’, ‘Valor’, and ‘Węgierka Zwykła’, all of them originating from the pilot plant in Przybroda run by the Department of Pomology, the August Cieszkowski Agricultural University in Poznań. The antioxidant activity was determined colourmetrically using a cation-radical of 2,’2-azino-bis(3-ethylbenzthiazoline-6-sulphonic acid) (ABTS^•+), and the results were expressed in equivalents of µmol Trolox/g. The content of anthocyanins was determined using a differential spectrophotometric method according to Fuleki and Francis The antioxidant activity of fresh fruit ranged from 12.5 to 22.9 µmol Trolox/g. The cultivars of ‘Čačanska Najbolja’, ‘Bluefre’, and ‘Valor’ showed a high level of the antioxidant activity. The antioxidant activity converted per dry matter was high in the cultivars of ‘Bluefre’ and ‘Čačanska Najbolja’, and amounted to 162 and 144 µmol Trolox/g d.m, respectively. The cultivars of ‘Węgierka Zwykła’, ‘Węgierka Dąbrowicka’, and ‘Valjevka’ had a low antioxidant activity level. The highest content of anthocyanins was noted in the ‘Valor’ cultivar, 73,4 mg % d.m.