The olivaceous piculet (Picumnus olivaceus) is a species of bird in subfamily Picumninae of the woodpecker family Picidae.

Adult males of the nominate subspecies P. o. olivaceus have a black crown and nape with red tips on the feathers of the front and top and white spots on the rest.

Their chin and throat are buff to yellowish white with a fine darker scaly appearance.

P. o. dimotus has more of a greenish tinge to the upperparts, is paler and more olive below, and has yellow-orange tips on the crown feathers.

[4] The subspecies of the olivaceous piculet are found thus:[2][4] The olivaceous piculet inhabits a wide variety of landscapes including the edges of rainforest and cloudforest, drier forest, more open woodlands, secondary forest, plantations, and gardens.

[4] The olivaceous piculet forages on slender branches, stems, and vines, usually from the forest undergrowth to its mid-storey, though sometimes in the canopy.

It is typically seen singly, in pairs, or in small family groups and frequently joins mixed species foraging flocks.

[4] The olivaceous piculet's breeding season varies latitudinally, for example from December to May in Costa Rica and February to September in Colombia.

The olivaceous piculet's voice is "a high thin chippering trill, often descending in pitch.