Slender may refer to:
- Gracility or slenderness
- Abraham Slender, a character in William Shakespeare's The Merry Wives of Winsor
- Slender Man, a fictional supernatural character
- Slender Man stabbing, an attempted murder inspired by the story of the "Slender Man"
- Slender: The Eight Pages, previously known as Slender, a 2012 video game based on "Slender Man"
- Slender: The Arrival, the sequel to Slender: The Eight Pages
- Slender Rising, a game based on the "Slender Man"
- Slender Rising 2, sequel to Slender Rising
- Slender Man (film), a 2018 film based on the "Slender Man"
- Beware the Slenderman, a 2016 documentary based on the "Slender Man stabbing"