The purpose of this study was to examine the relation between mercury and selenium in tissues of hares from regions with variable environmental contamination. In this experiment 30 hares obtained during the hunting season 1988/89 from 3 different regions of Poland (a small farming area without industry, a large farming area with minimum of industry, and a typical heavy industrial area) were used.The concentration of mercury was estimated by AAS method using an automatic mercury analyser TMA-254. Selenium concentration was determined using a gas chromatograph Hewlett Packard equipped with an electron capture detector.The levels of Hg and Se among tissues vary and depend on the particular hare collection area. A positive correlation between Se and Hg in different tissues was observed. The highest correlation coefficient (r = 0.504, p < 0.01) was stated between hepatic Se and the mercury concentration in kidneys.