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Species in the <i>Botryosphaeriaceae</i> are common plant pathogens, endophytes, and saprobes found on a variety of mainly woody hosts. <i>Botryosphaeriaceae</i> is a high-profile fungal family whose genera have been subjected to continuous revisions in recent years. Surveys conducted during 2019 and 2020 on several decaying woody hosts (from dead arial twigs, branches, stems, bark, and seed pods) in China and Thailand revealed a high diversity of <i>Botryosphaeriaceae</i> fungi. Identification of 16 <i>Botryosphaeriaceae</i> isolates was carried out based on both morphological characteristics and phylogenetic analyses of combined ITS, LSU, <i>tef1-α</i>, and <i>tub2</i> sequence data. Four novel species (<i>Dothiorella ovata</i>, <i>Do. rosacearum</i>, <i>Do. septata</i>, and <i>Lasiodiplodia delonicis</i>) and seven previously known species (<i>Botryosphaeria fujianensis</i>, <i>Diplodia mutila</i>, <i>Di. seriata</i>, <i>L. crassispora</i>, <i>L. mahajangana</i>, <i>Macrophomina euphorbiicola</i> and <i>Sphaeropsis eucalypticola</i>) were identified while new hosts and geographical records were reported. This study indicates that the fungal family <i>Botryosphaeriaceae</i> seems to be common and widespread on a broad range of hosts in China and Thailand.