Zero day
- D-Day (military term)
- Day Zero (disambiguation)
- Mark Russinovich
- Ruth Ware
- Zero Day (American TV series)
- Zero Day (My Adventures with Superman)
- Zero Day (Person of Interest)
- Zero Day (Taiwanese TV series)
- Zero Day (album)
- Zero Day (film)
- Zero Day (novel)
- Zero Day Initiative
- Zero Days
- Zero Days (album)
- Zero Hour (disambiguation)
- Zero-day vulnerability
- Zero-day warez