巴西彩虹蚺（学名：Epicrates cenchria）为蚺科水蚺属下的一个种。

Epicrates cenchria is a boa species endemic to Central and South America. Common names include the rainbow boa, and slender boa. A terrestrial species, it is known for its attractive iridescent sheen caused by structural coloration. Nine subspecies are currently recognized, including the nominate subspecies described here.