Aleph One () is the second aleph number.
Aleph One may also refer to: Aleph One (game engine), an enhanced version of the Marathon 2 game engine Elias Levy, computer security professional, former moderator of Bugtraq Aleph-1 (album), a 2007 album by Alva Noto Aleph-1 may also refer to a Threnodian character in the game Wuthering Waves