Aleph One (disambiguation)

Aleph One ($$\aleph_1$$) 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