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<i>Ligustrum japonicum</i> is a common ornamental tree species in China. However, leaf spot disease has emerged in Rizhao City, Shandong Province of China in recent years. Members of <i>Pseudocercospora</i> are usually known as plant pathogens, mainly causing leaf spots and blights. Species of this genus are distinguished mainly based on morphological differences on the host plants, as well as the molecular data. A new species named <i>Pseudocercospora rizhaoensis</i> on <i>Ligustrum japonicum</i> is introduced herein based on morphology and molecular data of combined ITS, LSU, <i>act</i>, <i>tef1</i> and <i>rpb2</i> sequences. Koch’s postulates were confirmed by a pathogenicity test, re-isolation and identification.