Now I Know may refer to:
- Now I Know (song), a 1994 song by Lari White
- Now I Know (novel), a young adult novel by Aidan Chambers
- Now I Know (newsletter), a daily email newsletter about trivia
- Now I Know, a song by Rihanna, from the album Music of the Sun
- Now I Know..., a song by Lydia, from the album Devil
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