Eurema andersoni, commonly called the One-spot Grass-yellow is a small butterfly species seen in India. As suggested by its common English name, this species should be looked for on grasslands, and other open spaces. Present in NEERI urban forests is confined to forest many times.

This species has an extensive, though rather disjunct, distribution which includes parts of southern and northern India, and entire South East Asia.

The Grass Yellows are generally weak flyers, fluttering low around bushes and flowers. The identification of the species of Eurema is often not easy, particularly when the butterflies have a rather restless flight, and are alert when approached. The main identifying characteristics rely on certain distinguishing markings, particularly the number of spots at the cell on the underside of the forewing.

Wing spans 38-45 mm. Not a rare butterfly. Upper hind wing marginal border black, its inner towards apex. Underground color paler than upper. Under hind wing has a long streak in space 7, directed towards and contiguous with the disco celluar mark and discal streaks are connected to form a chain like band. Female paler on both sides with more rounded forewing than male.

One-spot Grass Yellow butterfly do mud-puddling. Mud-puddling is the phenomenon mostly seen in butterflies and involves their aggregation on substrates like wet soil, dung and carrion to obtain nutrients such as salts and amino acids.

Larval stages are data deficient.