The aim of the study was to clarify the changes in the pigment composition of Rhodopseudomonas yavorovii IMB B-7620 under the influence of ferric(III) citrate, cobalt(II) chloride, copper(II) chloride and potassium bichromate. Materials and methods. R. yavorovii IMV B-7620 bacteria were grown at + 27 ... + 30 °C for 14 days in ATCC No 1449 medium supplemented with 1.0–12.0 mM ferric(ІІІ) citrate, 1–15 mM cobalt(II) chloride, 0.050–0.500 mM copper(II) chloride, or 0.010–0.045 mM potassium dichromate. The bacterial cells were sedimented, resuspended in acetone, and disintegrated by sonication. The resulting suspension was kept for 24 hours at -20 °C, after which it was centrifuged, and 0.5 ml of supernatant were filtered through membrane filters (pore diameter 0.45 μm). Chromatographic separation of pigments was performed using a high-performance liquid chromatography system. Results. On the 14th day of cultivation under the influence of heavy metal compounds, the qualitative and quantitative changes in the pigment composition in R. yavorovii IMV B-7620 cells occurred. Under the influence of ferric(ІІІ) citrate, cobalt(II) chloride, and potassium dichromate, a decrease in the pigment content in R. yavorovii IMV B-7620 cells was detected. The content of lycopene decreased by 22.1–83.9%, bacteriochlorophyll a – by 33.8–86.0%, compared to the control. Under the influence of copper(II) chloride, not only the pigment content but also the quantity of its isomers increased. Under the influence of the studied metal compounds, a small amount of anhydrorhodovibrin was detected in the cells, whereas it was not detected in the control. Conclusions. Under the influence of heavy metal compounds, changes in the qualitative and quantitative composition of pigments occur in the cells of bacteria R. yavorovii IMV B-7620. Ferric(III) citrate, cobalt(II) chloride and potassium bichromate caused a decrease in the pigment content in R. yavorovii IMV B-7620 cells. Under the influence of copper(II) chloride, not only the content of pigments increased, but also the quantity of their homologues and isomers, in particular lycopene, which can perform a protective function. Under the influence of all the studied metal salts, a small content of anhydrorhodovibrin was detected in the cells, which was not detected in the control. It can also contribute to the protection of cells from stressors.