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Amongst the Australasian kangaroos and wallabies (Macropodidae) one anomalous genus, the tree-kangaroos, Dendrolagus, has secondarily returned to arboreality. Modern tree-kangaroos are confined to the wet tropical forests of north Queensland, Australia (2 species) and New Guinea (8 species). Due to their behavior, distribution and habitat most species are poorly known and our understanding of the evolutionary history and systematics of the genus is limited and controversial. We obtained tissue samples from 36 individual Dendrolagus including representatives from 14 of the 17 currently recognised or proposed subspecies and generated DNA sequence data from three mitochondrial (3116 bp) and five nuclear (4097 bp) loci. Phylogenetic analysis of these multi-locus data resolved long-standing questions regarding inter-relationships within Dendrolagus. The presence of a paraphyletic ancestral long-footed and derived monophyletic short-footed group was confirmed. Six major lineages were identified: one in Australia (D. lumholtzi, D. bennettianus) and five in New Guinea (D. inustus, D. ursinus, a Goodfellow's group, D. mbaiso and a Doria's group). Two major episodes of diversification within Dendrolagus were identified: the first during the late Miocene/early Pliocene associated with orogenic processes in New Guinea and the second mostly during the early Pleistocene associated with the intensification of climatic cycling. All sampled subspecies showed high levels of genetic divergence and currently recognized species within both the Doria's and Goodfellow's groups were paraphyletic indicating that adjustments to current taxonomy are warranted., (Copyright © 2018 Elsevier Inc. All rights reserved.)