Euphorbia paralias, the Sea Spurge,[1] is a species of flowering plant in the family Euphorbiaceae, native to Europe, northern Africa and western Asia.

[5] E. paralias is an erect, glaucous, perennial plant, growing up to 70 centimetres (28 in) tall.

The cauline leaves (arising from the stem, without a stalk) are crowded, overlapping, elliptic-ovate (ovate toward the top of the stems), fleshy and 5–20 millimetres (0.2–0.8 in) long.

The flower head is on a solitary cyathium, found in upper forks or at the apex, surrounded by bell-shaped bracts.

The fruit is a capsule, flattened from above or nearly spherical, with deep furrows, and wrinkled on keels.