Dolichoglottis lyallii, the yellow snow margueritte, is a species of flowering plant, endemic to New Zealand.
Dolichoglottis lyallii has yellow ligules, up to 2.5 cm long, and the capitulum (or flower head) appears entirely yellow. It is a tall flower, growing up to 50 cm. The leaves are long and grass-like.
Dolichoglottis lyallii is a rhizomatous geophyte, and a perennial plant.
Dolichoglottis lyallii is native to the South Island and Stewart Island.
The specific epithet, lyallii is named for David Lyall.