Spyridium riparium is a species of flowering plant in the family Rhamnaceae and is endemic to the south of Western Australia.

It is an erect shrub, usually with narrowly egg-shaped leaves, and clusters of densely hairy, white or cream-coloured flowers.

The flowers are white or cream-coloured, and borne on the ends of branches in dense clusters 10–18 mm (0.39–0.71 in) wide, and in smaller groups in leaf axils.

[2][3] Spyridium riparium was first formally described in 1995 by Barbara Lynette Rye in the journal Nuytsia from specimens collected by Belinda Hammersley, near the Mitchell River in 1993.

[2][3][6] Spyridium riparium is listed as "Priority Two" by the Western Australian Government Department of Biodiversity, Conservation and Attractions,[3] meaning that it is poorly known and from only one or a few locations.