Book one or book 1 can refer to:
*''
Book One: Water'', the first season of the animated television series ''Avatar: The Last Airbender''
*''
Book One: Air'', the first season of the animated television series ''The Legend of Korra''
* "Book One," a colloquial term for the self-help book ''
Dianetics: The Modern Science of Mental Health'' by L. Ron Hubbard
* ''Book 1'', upcoming studio album by
Grimes
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