A vittra (plural: vittror) is a type of wight (a term for supernatural spirits) from northern Sweden and Finland.
They were associated with herding, either cattle or reindeer; they were believed to live normally among humans and only revealed a supernatural nature if their livestock were mistreated.
[1] Like the hulder and the skogsrå, the vittra is also associated with longing and desire.
[2] The vittra appears as a beautiful, female wight who seduces men in the forest.
[2] Vittror appear in the movie The Evil Dead by Sam Raimi.