Euphorbia oblongata is a species of flowering plant in the family Euphorbiaceae.

It is native to Eurasia but can be found elsewhere as a weedy introduced species.

This is a hairy perennial herb growing to maximum heights of just over half a metre.

It has oval-shaped or narrow leaves with finely toothed edges which are 4 to 6 centimetres long.

The fruit is a spherical capsule about half a centimetre long which contains smooth brown seeds.