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<p>In 2020, a new subspecies was described in the <i>Cercopithecus mitis</i> complex, the Manyara monkey <i>C. m. manyaraensis</i>, Butynski &amp; De Jong, 2020. The internal taxonomy of this species complex is still debated, and the phylogenetic relationships among the taxa are unclear. Here we provide the first mitochondrial sequence data for <i>C. m. manyaraensis</i> to determine its position within the mitochondrial phylogeny of <i>C. mitis</i>. This subspecies clusters within the youngest (internal divergences between 1.01 and 0.42 Ma) of three main taxonomic clades of <i>C. mitis</i>. Its sister lineages are <i>C. m. boutourlinii</i> (Ethiopia), <i>C. m. albotorquatus</i> (Kenya and Somalia), <i>C. m. albogularis</i> (Kenya and Tanzania), and <i>C. m. monoides</i> (Tanzania and Mozambique). In general, the phylogenetic tree of <i>C. mitis</i> based on mitochondrial sequence data indicates several paraphyletic relationships within the <i>C. mitis</i> complex. As in other African cercopithecines (e.g. <i>Papio</i> and <i>Chlorocebus</i>), these data are suitable for reconstructing historic biogeographical patterns, but they are only of limited value for delimitating taxa.</p>