Astragalus iselyi is a rare species of flowering plant in the legume family known by the common name Isely's milkvetch. It is endemic to Utah in the United States. This perennial herb grows up to 25 centimeters tall. It produces yellowish white flowers nearly 2 centimeters long. The fruit is an inflated, rough-haired legume pod up to 3.8 centimeters long.