The Changeable Grass Yellow (Eurema simulatrix) is a butterfly in the Pieridae family. It is found from Burma to Sundaland and the Philippines. The habitat consists of secondary or disturbed habitats including forest clearings, roadsides and riverbanks, parks and gardens.The length of the forewings is 21–26 mm (0.83–1.02 in) for males and 19–25 mm (0.75–0.98 in) for females.