Sylvirana cubitalis, the Siam frog, Siamese frog yellow stream frog, darkeared frog, or black-eared frog is a species of frog in the family Ranidae. It is found in Myanmar, Thailand, Laos, China, and possibly Vietnam.
Its natural habitats are monsoon evergreen forest and rainforest, usually near fast-flowing streams, creeks and rivers. It is not considered threatened by the IUCN.