Calochortus gunnisonii is a species of flowering plant in the lily family, Liliaceae. It is commonly known as Gunnison's mariposa lily. The plant is native to the western United States. It has a bulbous root and produces a single stem with a few leaves and 1-3 flowers at the top of the stem. The flowers are large and showy, with white petals that are tinged with pink or lavender and a yellow center.