| Summary: | Pestalotiod fungi are associated with a wide variety of plants worldwide and occur as endophytes, pathogens, and saprobes. The present study provides an updated phylogeny for genera <i>Neopestalotiopsis</i>, <i>Pestalotiopsis,</i> and <i>Seiridium</i> using fresh collections from woody oil plants (<i>Camellia oleifera</i>, <i>Olea europaea</i>, <i>Paeonia suffruticosa</i>, <i>Sapium sebiferum,</i> and <i>Vernicia fordii</i>) in Sichuan Province, China. We coupled morphology and combined sequence data analyses of ITS, <i>tub2</i>, and <i>tef1-α</i> for <i>Neopestalotiopsis</i> and <i>Pestalotiopsis</i>, with ITS, LSU, <i>tub2</i>, <i>tef1-α</i>, and <i>rpb2</i> for <i>Seiridium</i>. Three novel species of <i>Neopestalotiopsis</i> (<i>N. mianyangensis</i>, <i>N. paeonia-suffruticosa</i>, <i>N. terricola</i>) and three of <i>Seiridium</i> (<i>S. guangyuanum</i>, <i>S. vernicola, S. oleae</i>), were found. Three other species, <i>Pestalotiopsis kenyana</i>, <i>Seiridium ceratosporum,</i> and <i>S. rosarum</i> were identified and reported as new records. All isolated species are fully described and illustrated. Additionally, the sexual morph of <i>Pestalotiopsis kenyana</i> is described for the first time. Pathogenicity tests revealed that <i>Neopestalotiopsis mianyangensis</i>, <i>N. paeonia-suffruticosa, N. terricola, Pestalotiopsis kenyana, Seiridium guangyuanum</i>, <i>S. vernicola</i>, and <i>S. oleae</i> are pathogenic on detached olive leaves.
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