The diet composition of red deer (Cervus elaphus L.) was studied from October 2001 to November 2002 in the floodplain forest along the Morava River by the microscopic analysis of 310 red deer pellets. The shoots of broadleaved trees formed the main component of red deer diet throughout the year, 71 % of volume on the average. The trophic diversity was the highest at the end of summer and in autumn, when red deer consumed in more fruits, forbs, grasses and also the crops on fields near the forest, e.g. maize. The majority of the diet originated from the forest, whereas fields were visited only at the end of summer and in autumn. Additional feeding during winter does not play an important role in the diet of red deer. The analysis of feeding behaviour showed that in the floodplain forest red deer were browse specialists in all seasons of the year. Other food sources were less important.