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<i>Periconia</i> is a polyphyletic and asexual morphic genus within the family Periconiaceae (Pleosporales). The genus is characterized by a pale to dark brown stipe with an apical conidial head and ellipsoidal to oblong conidia. Species of <i>Periconia</i> are widely distributed throughout the world in various hosts, while most species are isolated from graminaceous plants. During our investigations of microfungal in Sichuan Province, China, 26 <i>Periconia</i> isolates were collected from a wide variety of graminaceous plants. These isolates corresponded to 11 species based on the examination of morphology and multi-locus phylogenetic analysis (SSU, ITS, LSU, <i>TEF1</i>, <i>RPB2</i>). This includes six new species (<i>P. chengduensis</i>, <i>P. cynodontis</i>, <i>P. festucae</i>, <i>P. imperatae</i>, <i>P. penniseti,</i> and <i>P. spodiopogonis</i>) and five new records (<i>P. byssoides</i>, <i>P. chimonanthi</i>, <i>P. cookie</i>, <i>P. pseudobyssoides</i>, and <i>P. verrucosa</i>). A comprehensive description and illustrations of the new species are provided and discussed with comparable taxa. These discoveries expand our knowledge of the species diversity of <i>Periconia</i> taxa in graminaceous plants in China.