Eurema simulatrix, the changeable grass yellow, is a butterfly in the family Pieridae.

It is found from Burma to Sundaland, Cambodia and the Philippines.

[2] The habitat consists of secondary or disturbed habitats including forest clearings, roadsides and riverbanks, parks and gardens.

[4] Adults have two cell spots on the underside of the forewings and a large, almost cleft, reddish-brown apical spot on the forewing.

[5] The following subspecies are recognised:[1] Eurema irena is sometimes treated as a subspecies of Eurema simulatrix.