普通蚯蚓是一种蚯蚓，原分布在欧洲地区，现已广泛分布在全球各地。

Lumbricus terrestris is a large, reddish worm species widely distributed around the world (along with several other lumbricids). In some areas where it is an introduced species, some people consider it a serious pest for outcompeting native worms.

Through much of Europe, it is the largest naturally occurring species of earthworm, typically reaching 20 – 25 cm in length when extended (though in parts of southern Europe, the native species are much larger). In September 2012, a specimen was found in SW China measuring roughly 50 cm in length. It has an unusual habit of copulating on the surface at night, which makes it more visible than most other earthworms.