Euphorbia maculata, known as spotted spurge, prostrate spurge (not to be confused with Euphorbia prostrata), milk purslane, or spotted sandmat, is a fast-growing annual plant in the family Euphorbiaceae. It is native to North America, where it is generally considered a common weed. It can be found in disturbed soils such as garden beds, along railroad tracks, and in the cracks of sidewalks. It has become a common introduced species throughout the world, including Europe, Japan, Korea, Australia, and New Zealand.

It grows in sunny locations and a variety of soils, and functions as a pioneer species in ecological succession. The sap of this plant is a mild skin irritant and can cause a rash in some people. The milky sap of plants in genus Euphorbia is poisonous and considered carcinogenic.