Nicollet, or Nicolet may refer to:
- Aurèle Nicolet, Swiss flautist.
- Joseph Nicollet, the French explorer from the 19th century
- Various places in the U.S. state of Minnesota, all named for Joseph Nicollet, including:
- Nicollet, Minnesota, a small city
- Nicollet County, Minnesota
- Nicollet Township, Nicollet County, Minnesota
- Nicollet Avenue, a major street in Minneapolis
- Nicollet Island in the Mississippi River north of downtown Minneapolis
- Nicollet Mall in downtown Minneapolis
- Nicollet Park, former baseball stadium in Minneapolis
- Nicollet (crater) on the Moon
- Nicollet (Amtrak), a Chicago-Milwaukee train
- Jean Nicolet, a French explorer from the 17th century
- Various places in the Canada and the U.S. states of Wisconsin and Michigan, all named for Jean Nicolet, including:
- Nicolet, Quebec
- Chequamegon-Nicolet National Forest
- Nicolet Area Technical College
- Nicolet High School