tBiotransformation of 4-chromanone and its derivatives in the cultures of three biocatalysts: Didymo-sphaeria igniaria, Coryneum betulinum and Chaetomium sp. is presented. The biocatalysts were chosendue to their capability of enantiospecific reduction of low-molecular-weight ketones (acetophenone andits derivatives and - and -tetralone). The substrates were reduced to the respective S-alcohols withhigh enantiomeric excesses, according to the Prelog’s rule. In the culture of Chaetomium sp. after longerbiotransformation time an inversion of configuration of the formed alcohols was also observed. Thehighest yield of transformation was observed for 6-methyl-4-chromanone. In all the tested cultures, thehigher was the molecular weight of a chromanone, the lower conversion percent was observed