United Voice was an Australian trade union from 1992 to 2019. It merged with the National Union of Workers to form the United Workers Union in 2019. United Voice was part of the Labor Left faction of the Australian Labor Party.

Ray Gietzelt AO was a major figure in the Australian union movement in the latter part of the 20th century. He led the Federated Miscellaneous Workers' Union of Australia from 1955 to 1984. Ray Gietzelt exerted major influence in the careers of Bob Hawke, Neville Wran and Lionel Murphy, and he was made a Life Member of the Australian Labor Party.