绿蠵龟（学名：Chelonia mydas、英文：green sea turtle），又称绿海龟，是[海洋]中的爬行类动物，是海龟属下的唯一一种。一生中大多的时间都在海中生活，但演化过程中仍然保留了部分祖先的生活方式，所以必须回到出生地上产卵，繁育后代，形成了一种较独特的生活习性。

绿蠵龟广泛分布在热带及亚热带海域中，即约南北纬度20℃等温线之间的海域，并在水温逾摄氏25度的沙滩上产卵。由于牠用肺呼吸，于海中的潜水深度极限约一、两百公尺。绿蠵龟的主食为海中的海草与大型海藻，因此体内脂肪累积了许多绿色色素，呈现淡绿色，也因而得名。

The green sea turtle (Chelonia mydas), also known as the green turtle, black (sea) turtle, or Pacific green turtle, is a large sea turtle of the family Cheloniidae. This species is named for the green color of its fat, rather than the color of its skin or shell as most people think. These turtles shells are in fact olive to black. It is the only species in the genus Chelonia. Its range extends throughout tropical and subtropical seas around the world, with two distinct populations in the Atlantic and Pacific Oceans. The common name comes from the usually green fat found beneath its carapace.