Lupinus latifolius is a species of lupine known by the common name broadleaf lupine or stream lupin. It is native to western North America from British Columbia to Baja California to New Mexico, where it is common and can be found in several types of habitat.

There are several subtaxa, described as subspecies or varieties, some common and some rare. They vary in morphology.

In general this plant is an erect perennial herb. It grows 30 centimeters to over two meters in height, in texture hairy to nearly hairless. Each palmate leaf is made up of several leaflets, those on larger plants up to 10 centimeters long.

The inflorescence bears many flowers, sometimes in whorls. Each flower is one to two centimeters in length, purple to blue to white in color, the spot on its banner yellowish, pinkish, or white.

It is a larval host to Boisduval's blue, clouded sulphur, orange sulphur, Persius duskywing, and silvery blue butterflies.

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