One Voice may refer to:

• One Voice (film), 2011 documentary on high school Hawaiian choral groups

• One Voice (organization), a Philippine political group opposing the proposed constitutional changes or "Charter Change"
• One Voice (France), a French organisation founded by Muriel Arnal in 1995 under the patronage of Professor Theodore Monod (1902-2000) for the absolute animals’ rights to respect
• 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 (group), an all-girl singing group, stylized as OneVo1ce

• One Voice (Grace Kennedy album), 1979
• One Voice (Barry Manilow album), 1979
• One Voice (Barbra Streisand album), 1987
• One Voice (Agnostic Front album), 1992
• One Voice (Billy Gilman album), 2000
• One Voice (Andrew Johnston album), 2008
• One Voice (Micah Stampley album), 2011
• One Voice (Aled Jones album), 2016
  • One Voice at Christmas, Aled Jones follow-up later the same year
• One Voice (Kyuhyun album), 2017

• "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
• "One Voice", a song by The Wailin' Jennys on their album 40 Days