Zero day

• Zero-day (computing), a software vulnerability unknown to those who should be interested in its mitigation
• Zero Day Initiative, an international software vulnerability initiative
• Zero-day warez, copyrighted software that is cracked on the same day it is released

• Zero Day (2003 film), an American film by Ben Coccio
• Zero Days, a 2016 American documentary film
• Zero Day (American TV series), a 2025 American political thriller series
• Zero Day (Taiwanese TV series), a 2025 Taiwanese speculative fiction series
• "Zero Day" (My Adventures with Superman), a 2023 TV episode
• "Zero Day" (Person of Interest), a 2013 TV episode

• Zero Day (novel), a 2011 thriller novel by David Baldacci
• Zero Day, a 2011 novel by Mark Russinovich
• Zero Days, a 2023 novel by Ruth Ware

• Zero Day (album) or the title song, by MC Frontalot, 2010
• Zero Days (album) or the title song, by Prong, 2017

• D-Day (military term)
• Day Zero (disambiguation)
• Zero Hour (disambiguation)

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