Nico Nico Douga (, Niko Niko Dōga?, lit. "Smiley videos") is a popular video sharing website in Japan managed by Niwango. Its nickname is "Niconico" or "Nico-dō", where "nikoniko" is the Japanese ideophone for smiling.

Nico Nico Douga is the ninth most visited website in Japan. The site won the Japanese Good Design Award in 2007, and an Honorary Mention of the Digital Communities category at Prix Ars Electronica 2008. Users can upload, view and share video clips.

Unlike other video sharing sites, however, comments are overlaid directly onto the video, synced to a specific playback time. This allows comments to respond directly to events occurring in the video, in sync with the viewer - creating a sense of a shared watching experience. Nico Nico Douga's atmosphere is close to 2channel's or Futaba Channel's, and many popular videos have otaku tastes, such as anime, computer games and pop music.

Nico Nico Douga offers tagging of videos. Tags may be edited by any user, not just the uploader. Each video may have up to ten tags, of which up to five may be optionally locked by the uploader, but all others may be edited by any user.

Frequently these tags are used not only as categorization, but also as critical commentary, satire, or other humor related to the video's content. The site is also known for its medleys of popular songs on the website, most notably Kumikyoku Nico Nico Douga. Other features include:

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