Suuwassea is a genus of dicraeosaurid sauropod dinosaur found in the Upper Jurassic strata of the Morrison Formation, located in southern Carbon County, Montana, United States.

[1] Since the fossil was found in an ancestral territory of the Native American Crow tribe, the etymology of the generic name is derived from a term in their language, suuwassa, “the first thunder heard in spring”.

The specific descriptor honours the deceased sponsor of the expeditions that recovered the fossil, Emilie deHellebranth (1914–2001).

The herbivore differs from dicraeosaurids in the unfused state of the frontal, and from diplodocids in the arrangement of bones around the foramen magnum, though it possesses a greater number of similarities with the latter than with clade Dicraeosauridae.

In the original description, Suuwassea was placed at Flagellicaudata incertae sedis due to the mosaic of primitive and derived characters found in both dicraeosaurids and diplodocids.