| Summary: | The fungal genus <i>Gnomoniopsis</i> (<i>Gnomoniaceae</i>, <i>Diaporthales</i>) has been reported all around the world and isolated from multiple plant hosts. Based on multilocus phylogenies from a combined dataset of internal transcribed spacer (ITS) region, the ribosomal RNA gene cluster, and partial regions of translation elongation factor 1 alpha (<i>tef1</i>) and partial beta-tubulin (<i>tub2</i>), in conjunction with morphological characteristics, we describe and illustrate herein four new species, including <i>Gnomoniopsis</i><i>diaoluoshanensis</i> sp. Nov., <i>G. lithocarpi</i> sp. Nov., <i>G. mengyinensis</i> sp. Nov. and <i>G.</i><i>yunnanensis</i> sp. Nov. Alongside this, their similarity and dissimilarity to morphologically-allied and phylogenetically-related species are annotated and discussed. For facilitating future identification, we update the key to all species currently recognized in this genus.
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