One Voice may refer to:
- One Voice (film), 2011 documentary on high school Hawaiian choral groups
- One Voice (band), an all-girl singing group
- One Voice (organization), a Philippine political group opposing the proposed constitutional changes or "Charter Change."
- One Voice Children's Choir, a children's choir based in Utah
- One Voice Mixed Chorus, a GLBTA mixed chorus in Minnesota
- OneVoice Movement, an international mainstream grassroots movement in Israel/Palestine empowering moderates for conflict resolution
- One Voice Technologies, a developer of intelligent personal assistant technology
- One Voice (Barry Manilow album), the eighth studio album by singer and songwriter Barry Manilow
- One Voice (Barbra Streisand album), the third live album by Barbra Streisand
- One Voice (Billy Gilman album), the debut album of country-pop child singer Billy Gilman
- One Voice (Agnostic Front album), an album by New York hardcore band Agnostic Front
- One Voice (Andrew Johnston album), the debut album of Andrew Johnston
- "One Voice" (Billy Gilman song), the lead single from Billy Gilman's album One Voice
- "One Voice", a song by Brandy from her album Never Say Never
- "One Voice", a song by the Gear Daddies from their album Billy's Live Bait
- "One Voice", a song by Pennywise from their album Straight Ahead
- "One Voice", a song by Patti Smith from her album Gung Ho
- "One Voice", a song from Barry Manilow's One Voice (Barry Manilow album).
- "One Voice", a song by The Wailin' Jennys on their album 40 Days
- "One Voice", a song by Jane McDonald on her album Jane and performed on "Live at the London Palladium" her live show, and the accompanying DVD and CD
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