The Brown-headed Greenlet has a brown head and olive-green back. In northern Brazil it occurs in flooded forest and white-sand woodland, where it searches leaf undersides for insects and caterpillars. Its range also extends into eastern Colombia and southern Venezuela.
The crown is brown, the back and wings olive-green, and the underparts grayish white. The upper bill is dark, while the lower bill is pinkish yellow.
Brazilian records include flooded igapó forest and white-sand campina. It forages in pairs or mixed flocks among leafy branches, hanging beneath leaves to take insects and caterpillars; it also eats small fruit.
An extinction-risk assessment has not been added yet.