Slender Man or Slenderman is a supernatural figure who is typically depicted in internet memes as an abnormally tall, thin man with white skin and no facial features.

The first known use of the character was on an internet forum in 2009 by a user called Eric Knudsen. During a Photoshop contest on the website Something Awful, users were challenged to ‘paranormalise’ real-life pictures. Knudsen (going by the username Victor Surge) contributed the original image of Slender Man, holding hands with a young girl.