饰纹姬蛙（学名：Microhyla ornata），俗称小雨蛙，为姬蛙科姬蛙属的两栖动物。

体长约2厘米多，叫声为低沉、整齐而具有节奏感的「ㄍㄧ～ㄍㄧ」声，外表特征如下：

• 体色为土褐色或灰棕色。
• 背上有两条深棕色纹，由两眼睑间延伸到身体后端，因而得名。
• 四肢都有横斑，白色腹面。
• 趾间有微蹼，雄蛙在咽下有单个外声囊。
• 喉部鸣囊的地方为黑色。
• 头小而尖，身体较娇小肥短，身体略呈三角形。

Microhyla ornata (commonly known as the ornate narrow-mouthed frog, ornate narrow-mouthed toad, or ornamented pygmy frog) is a species of microhylid frog found in South Asia. This amphibian is distributed in Kashmir, Nepal, peninsular India and the Andaman and Nicobar Islands, Sri Lanka, and Bangladesh. It was previously considered to be the same species as Microhyla fissipes, therefore the aforementioned common names can refer to either species.