The objective of the research study was to determine the effect of various distillery yeast strains and the addition of stimulants (mineral compounds) on the rate and efficiency of alcoholic fermentation process of molasses. Furthermore, the quality of the raw spirit produced was assessed. It was proved that the type of distillery yeast strains and the addition of stimulants were significant. Upon the application of O₁₁ species of yeasts, after 72 hours of the fermentation process, the alcoholic strength level was 8.04 % (v/v). It was 15 % higher than the alcoholic strength level of alcohol produced using D-2 yeasts and 3 % higher when using As-4 yeasts. The addition of stimulants in the form of mineral compounds caused the growth rate of distillery yeasts to increase and, consequently, the efficiency of alcoholic fermentation to increase. The highest alcohol yield was reported when using stimulants in the form of a mixture of: magnesium sulphate (VI), ammonium phosphate (V), and calcium pantothenate (sm+fa+pw). In that variant, after 72 hours of the process, the alcohol yield from sucrose contained in the molasses was 63.16 dm³ EtOH·100· kg^-1 (and the fermentation efficiency was 92.83 %), and it was 5 % higher compared to the control sample (60.07 dm³ EtOH·100 kg^-1 of sucrose). The most important effect of the use of fermentation stimulants was the improvement of raw spirit quality. Compared to the control sample, the obtained content of aldehydes was 69 % lower.