Astragalus osterhoutii, or the Osterhout milkvetch or Kremmling milkvetch, is an endangered species of milkvetch, discovered and collected in 1905 at Sulfur Spring in Grand County Colorado by Colorado botanist George Everett Osterhout for which the plant was named. It is found in the U.S. state of Colorado, in a 13 kilometres (8.1 mi) radius near the town of Kremmling.

The Osterhout milkvetch is a perennial dicot. It belongs to the pea family, Fabaceae, and is in the Astragalus L. genus.

Conservation efforts are centered around maintaining the populations and habitat due to the limited population numbers and limited range.

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