Hosackia oblongifolia, synonym Lotus oblongifolius, is a species of legume native to western North America from Oregon to northern Mexico.

It is a spreading or upright perennial herb lined with leaves each made up of 3 elongated oval leaflets each up to 2.5 centimeters long.

The inflorescence bears several yellow and white flowers between 1 and 2 centimeters long.

Plants with copper colored flowers have been separated by some sources as var.

They are found in the Sierra Nevada slopes of Tulare County, California.