Nightside may refer to:
- Nightside with Dan Rea, talk radio show hosted by Dan Rea
- The Nightside, hosted by Mark Elliot
- NBC Nightside, an American overnight television news program on NBC
- Nightside (book series), a series of fantasy-noir novels by Simon Green
- Nightside (comics), a fictional character in the Marvel Universe
- Nightside (film), a 1980 television pilot starring Doug McClure
- Night side of a planetary body, divided from the daylit side by the terminator (solar)
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