Langsuir is a version of Pontianak, popular in Malaysia as one of the deadliest banshees in Malay folklore. Different from the Pontianak, which always appeared as a beautiful woman to devour the victim, Langsuir would possess the victim and suck blood from the inside, slowly causing a fatal death.

It is believed that langsuir are from women who had laboring sickness (meroyan) as a result of suffering the death of their children and who themselves died afterwords. Portrayed as hideous, scary, vengeful and furious, the Langsuir is further characterized as having red eyes, sharp claws, long hair, a green or white robe (most of the time), a rotten face and long fangs.

It is also believed Langsuir has a hole behind the neck(which is used to suck blood) and if people put Langsuir's hair in this hole(or cut their claws), Langsuir will be a human again. These are the common images described by people who claimed to have seen one. Pontianaks are sometimes claimed to be the still-born children of langsuir.