Taiwan Barbet Psilopogon nuchalis is a primary cavity nester, and it creates niches for a variety of cavity-nesting and cavity-roosting organisms. However, information on barbet nesting in natural cavities is lacking. We present the results of a 5-yr study on natural nest-sites of the Taiwan Barbet in an urban area. The data, including descriptions of nest cavity trees and locations, were collected during the breeding seasons of 2008~2012 in Taipei Botanical Garden and its surrounding sidewalks. A variety of tree species and wide ranges of tree heights and tree diameters were selected by the barbets as nest trees. In nest trees, numbers of limbs of the first order had large ranges, as did those of the second order. Nest heights and tree (branch) diameters at nests also considerably varied. Large-diameter camphor trees Cinnamomum camphora were the major nest trees used by the Taiwan Barbet, for which the possible reasons might be camphor tree’s dominance and its moderate oven-dry specific gravity (i.e., 0.4 g cm-3). Live trees with dead limbs were excavated by the birds 4 times as often as dead trees. One possible reason is that the number of dead trees in this urban area was limited, because some dead trees had been removed to prevent damage to people and their property. Although the Taiwan Barbet mostly used live trees as nest trees in this urban area, we found most of the cavities on decaying trunks or limbs of live nest trees. This fact indicated that the decayed part might facilitate cavity excavation by the birds. About half of nest sites had tree or branch diameters of 14~19 cm, which indicated that a barbet usually selected a mediumsized trunk or branch to make its nest cavity. When managing urban forests, it is recommended that medium-sized dead trees and medium-sized dead limbs on live trees be retained to meet the cavity needs of the barbet’s urban populations. Furthermore, the cavity resources will also benefit cavityusing communities in urban areas.