<em>Pistacia integerrima</em> is a deciduous tree species belonging to the family Anacardiaceae. The plant possesses numerous phytochemicals of ethno-medicinal importance. In a routine mycological survey carried out from July 2013 to June 2014, leaves of <em>P. integerrima</em> were found infected with fungi causing rust and blight diseases. The morphological and microscopic observations revealed three fungi, namely <em>Skierka himalayensis</em>, <em>Pestalotiopsis</em> sp., and <em>Pileolaria pistaciae</em>, which were found to cause rust and blight diseases. One new species of rust fungi, namely <em>Skierka himalayensis</em> sp. nov., and <em>Pestalotiopsis</em> sp. are reported for the first time from India. The detailed descriptions and illustrations of these three phytopathogenic fungi are provided in this paper.