365 may refer to:

• 365 (number), an integer
• a common year, consisting of 365 calendar days
• AD 365, a year of the Julian calendar
• 365 BC, a year of the 4th century BC

• 365 (media corporation), Icelandic TV company
• 365 Media Group, UK sports betting company

• 365 (album), a 2012 album by Taiwanese Mandopop trio boyband JPM
• "365" (Zedd and Katy Perry song), 2019
• "365" (Loona song), 2019
• "365", by Amaranthe, 2018
• "365", by Charli XCX from Brat, 2024
• "365", by Nicole C. Mullen from Christmas in Black and White, 2002
• "365", by Tiara Andini from Tiara Andini, 2021
• "3.6.5", by Exo from XOXO, 2013
• K.365, Concerto for 2 pianos & orchestra in E flat major ("Concerto No. 10"), K. 365 (K. 316a) by Wolfgang Amadeus Mozart
• "365", a song by DJ Khaled featuring Kent Jones, Ace Hood and Vado, made for the soundtrack of NBA 2K16

• Microsoft 365, a line of subscription services for office software
• Microsoft Dynamics 365, a product line of enterprise resource planning and customer relationship management
• Windows 365, a cross-platform usage subscriptions to virtualized Windows desktops

• Ferrari 365, a grand tourer produced by Ferrari

• 365 days (disambiguation)