The Ashy-headed Tyrannulet occurs in the Andes from Venezuela to Peru. It forages in middle and upper forest levels and may join mixed-species flocks.
It has a gray crown and a black half-moon-shaped patch behind the ear. The underside is bright yellow, the wings have two pale bars, and the breast has faint olive streaks.
It forages singly or in pairs in middle to upper forest levels and along forest edges. The account notes that it often follows mixed-species flocks.
An extinction-risk assessment has not been added yet.