Pisonia grandis is an herb claimed to be used for treatment of various diseases by local folks. Since, this plant possesses many medicinal properties; there are not many scientific studies carried out on this plant which promoted us to pursue a systematic pharmacological evaluation of Pisonia grandis leaves to verify their medicinal properties. Bioassay- guided fractionation of ethanol extract of leaves of Pisonia grandis was studied for its anti-fungal activity against microorganisms Candida albicans, Aspergillus niger, Pencillium citrinum and Monascus purpureus by disc diffusion method. The ethanol extract showed good anti-fungal activity against Monascus purpureus comparable to standard clotrimazole.