Whizzer may refer to:
- Whizzer (motorcycles)
- Hamilton Whizzers, a hockey team
- An overhook
In roller coasters:
- Whizzer (roller coaster), two identical roller coasters at California's Great America (now defunct) and Six Flags Great America.
- Spinball Whizzer, a spinning roller coaster at Alton Towers in Staffordshire, England.
In comics:
- Whizzer (comics)
- Speed Demon (Marvel Comics), a comic character formerly known as the Whizzer
- Whizzer (Robert Frank), a Marvel comic book superhero
- Whizzer and Chips, a British comic
In toys:
- Wizzzer, a gyroscopic top from Mattel
In plays:
- A character in William Finn and James Lapine's Falsettos.