Five human intestinal Bifidobacterium spp. ( B. longum, B. adolescentis, B. breve, B. bifidum, and B. infantis) and intestinal microorganism ( Bacteriodes thetaiotaomicron, Clostridium perfringens, Eubacterium aerofaciens, and Enterococcus faecalis) were cultured in De Man Rogosa Sharpe (MRS) medium or thioglycollate medium supplemented (5% w/v) with different unifloral honeys (sourwood, alfalfa, or sage). Inoculated samples were incubated anaerobically at 37 °C for 48 h. Samples were collected at 12 h intervals and examined for specific growth rate. Levels of fermentation end products (lactic and acetic acids) produced by Bifidobacterium spp. were measured by high-pressure liquid chromatography. Growth of intestinal microorganisms co-cultured with Bifidobacterium spp. in the presence of different unifloral honeys were also examined. All three honeys enhanced ( p < 0.05) growth and activity of the five intestinal Bifidobacterium spp. Their effect on other organisms of the intestinal microflora was selective. Growth of C. perfringens and E. aerofaciens was inhibited ( p < 0.05) in the presence of honey and further inhibited when co-cultured with Bifidobacterium spp. Bifidobacterium spp. was not affected.