Apples (Idared) were subjected to osmotic dehydration in: a) 50% solutions of fructooligosaccharides (FOS) at 40–70 °C (apple/solution 1/2), b) 50% solution of FOS at 40 °C using different amount of solution (apple-solution ratio from 1/2 to 1/5), c) 50–65% solution of FOS at 40 °C (apple/solution 1/4). The content of fructooligosaccharides in dried material was determined. An increase in temperature and amount of the hypertonic solution intensified the migration of fructooligosaccharides to the fruit tissue. There was no direct relationship between the concentration of the hypertonic solution and the FOS content of dehydrated apples. the contents of fructooligosaccharides and dry substance in fruits dehydrated under different conditions were interlinked. Dehydrated apples of a content of fructooligosaccharides of 7–9% w/w were obtained when the content of dry substance was approximately 30%.