The olive-crowned flowerpecker (Dicaeum pectorale) is a small passerine bird in the flowerpecker family, Dicaeidae. It is found in far western New Guinea and on adjacent islands.
It is a small bird, with males having olive upperparts, greyish-green underparts, a white throat and a scarlet breast patch. Females are similar to males, but lack the scarlet breast patch. It is mainly frugivorous, also supplementally feeding on spiders.
The olive-crowned flowerpecker is a small bird, 9 cm in length and weighing 7–7.8 g. Nominate males have olive green upperparts and crown, yellowish rumps, grey-green underparts, yellowish-white central abdomen and undertail coverts, white throats, and a large scarlet patch on breast. Females are similar to males, but lack the scarlet throat patch and have yellower center of abdomen and undertail coverts. Juveniles are similar to females, but have more olive underparts.
Vocalisations include a short, insect-like buzzing note, a single, high upslurred note, and a drawn-out chew, repeated at intervals.