A flyer is a single page leaflet advertising a nightclub, event, service, or other activity. Flyers are typically used by individuals or small business and are a form of small scale, community communication.

Flyers are handed out on the street, posted on bulletin boards, or given away at events. Bulletin boards are found on college campuses, in cafes, community meeting houses, laundromats and small markets.

Flyers, along with postcards, leaflets and small posters, are vital and free forms of communication for people who want to engage the public but do not have the money or desire to take out classified advertising in a local newspaper. Their widespread use intensified with the spread of desktop publishing systems. Some flyers are humorous, irreverent or absurd.

The Craigslist website is a web-based system that mirrors the sort of community communication that occurs via flyering and bulletin boards.

Recently, flyposting (pasting flyers to walls) has been banned by many towns and cities in America, causing concern among media activists and ordinary citizens.

Flyer is also the name shared by various airplane designs built and flown by the Wright Brothers.