Lenny or Lennie may refer to:
People
- Lenny (given name)
Fictional characters:
- Lennie Small, a major character in the novel Of Mice and Men
- Lenny Leonard, on the television program The Simpsons
- Lenny, a character in the animated film Toy Story
- Lenny Kosnowski (of Lenny and Squiggy) on the Laverne & Shirley television show
- Lenny, a neopet
Titled expressive works:
- Lenny (album), by Lenny Kravitz
- "Lenny" (Stevie Ray Vaughan song), a track on the album Texas Flood
- "Lenny", a song by The Buggles. (1982)
- "Lenny", a song by Supergrass. (1995)
- Lenny (film), a 1974 biography of Lenny Bruce
- Lenny (TV series), a 1990–91 situation comedy starring Lenny Clarke
- "Lenny" (short story), a short story by author Isaac Asimov
Other:
- Hurricane Lenny, 1999 in the Atlantic Ocean
- Lennies, stationary lenticular clouds
- lenny, Debian 5.0-release of Linux operating system
- Lenny's Sub Shop, a sandwich-shop chain
- List of guitars used by Stevie Ray Vaughan#lenny, a guitar owned by Stevie Ray Vaughan