Stellaria littoralis is a species of flowering plant in the family Caryophyllaceae known by the common name beach starwort.

It is a rhizomatous perennial herb producing sprawling, branching stems which are four-angled and hairy in texture, reaching up to about 60 centimeters long.

The lance-shaped or pointed oval leaves are up to 4.5 centimeters long and are oppositely arranged in pairs.

The flower has five hairy, pointed green sepals each a few millimeters long.

This plant is similar to its Asian relative Stellaria dichotoma, and it may actually be a population of that species that was introduced to the California coast long ago.