日本林蛙（学名：Rana japonica）为蛙科蛙属的两栖动物。

身体长4－6厘米；背面和体侧为绿黄色、绿灰色、草黄色或浅棕色，有深灰色小点，四肢有横纹斑，鼓膜处有三角形黑斑；乳黄色或乳白色腹面；皮肤光滑，背侧褶明显，从眼睛后部直达胯部，在鼓膜上方不曲折；雄蛙没有声囊，第一指基部有灰白色指垫；趾间有蹼。

The Japanese brown frog (Rana japonica) is a species of frog in the Ranidae family, endemic to Japan. Its natural habitats are temperate grassland, rivers, swamps, irrigated land, and seasonally flooded agricultural land.