Calochortus pulchellus is a rare species of flowering plant in the lily family known by the common name Mt. Diablo fairy-lantern or Mount Diablo globelily.

Calochortus pulchellus is endemic to California, where it is mainly restricted to Mount Diablo of the Diablo Range, in Contra Costa County of the eastern San Francisco Bay Area. There are historical occurrences in the North California Coast Ranges, within Marin, Solano, Napa, and Humboldt Counties.

It grows in chaparral and woodland habitats, currently only known on the bayside−western slopes of Mount Diablo.

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