Sphinctospermum is a genus of flowering plants in the legume family, Fabaceae.

It is a monotypic genus, containing the single species Sphinctospermum constrictum.

It is native to North America, where it occurs in western and central Mexico and in Arizona in the southwestern United States.

It grows in sandy soils and is more common in wet years.

The genus Sphinctospermum (Leguminosae): Taxonomy and tribal relationships as inferred from a cladistic analysis of traditional data.