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Aim: In the present study, we determined the effect and optimum level of inclusion of a thermo-tolerant probiotic Saccharomyces cerevisiae OBV9 on nutrient intake and digestibilities in Murrah buffaloes (Bubalus bubalis). Materials and Methods: A straw based complete diet (crude protein (CP) 12%) with 0.1, 0.2 and 0.3% of lyophilized yeast was evaluated in a 4X4 Latin Square metabolism trial in fistulated Murrah buffalo steers (223.81 kg ± 2.91). Diet with no yeast was taken as control. Results: Dry matter intake (DMI) was not significantly (P>0.05) influenced by any level (%) of yeast in complete diet. The digestibility's (%) of dry matter (DM) and crude fibre (CF) were significantly (P<0.05) higher in 0.1% yeast supplemented diet compared to control, whereas organic matter, CP, ether extract and nitrogen free extract were not influenced by yeast treatments. The digestibility's of neutral detergent fibre (NDF), acid detergent fibre (ADF), hemicellulose, cellulose, total digestible nutrients (TDN%) and metabolizable energy (ME as MJ/kg DM) were significantly (P<0.05) higher in yeast supplemented diets compared to control. However, among the yeast supplemented diets the values were not (P>0.05) different from each other. Intake of DCP (g/d or g/kg w0.75), TDN (kg/d or g/kg w0.75), ME (MJ/d or MJ/kg w0.75) and N balance (g/d) were not (P>0.05) affected by the level of yeast in the diet. Conclusion: It can be concluded that, 0.1% thermo-tolerant yeast had greater influence on majority of the nutrients in the straw based complete diets of Murrah buffaloes.