滑鳞绿树蛇（学名：Cyclophiops major、Opheodrys vernalis），是蛇亚目游蛇科翠青蛇属下的一种无毒蛇类。

滑鳞绿树蛇是一种无毒蛇类，身长约100公分，最大有130公分，头部呈椭圆形，除了腹部是黄白色或苍绿色外，其他地方都是漂亮的翠绿色，身上也没有特殊的花纹，鳞片十分光滑。

The smooth greensnake (Opheodrys vernalis) is a nonvenomous North American colubrid. It is also referred to as the grass snake. It is a slender, "small medium" snake that measures 36–51 cm (14–20 in) as an adult. It gets its common name from its smooth dorsal scales, as opposed to the rough green snake, which has keeled dorsal scales. It is found in marshes, meadows, open woods, and along stream edges and is native to regions of Canada, Maine, Wisconsin, Illinois, Virginia, Wyoming, Utah, New Mexico, Iowa, Missouri, Colorado, Texas, Michigan and northern Mexico. A non-aggressive snake, it seldom bites and usually flees when threatened. It mates in late spring to summer and females lay their eggs from June to September.