The sooty-headed tyrannulet (Phyllomyias griseiceps) is a species of bird in subfamily Elaeniinae of family Tyrannidae, the tyrant flycatchers.

It is found in Brazil, Colombia, Ecuador, French Guiana, Guyana, Panama, Peru, Suriname, and Venezuela.

The separate populations are found thus:[6][7][8][9][10][11][12][13][excessive citations] The sooty-headed tyrannulet primarily inhabits humid evergreen forest in the tropical zone.

[6][13] The sooty-headed tyrannulet feeds primarily on insects and on lesser amounts of small fruits and berries.

It usually forages alone or in somewhat separated pairs unless in a fruiting tree and occasionally joins mixed-species feeding flocks.

It forages from the forest's mid-level to the canopy, taking prey and fruits by gleaning while perched and while briefly hovering.

Its song varies geographically, but in general is "an emphatic phrase of clear, short whistled notes, first one stressed, 'whip, whip-di-irip' or 'whit, whit-wheeu' ".