Socialist Unity (UK)
{{For|the group which stood candidates under this name in 2005|Socialist Unity Network}}
{{Use dmy dates|date=April 2025}}
{{Use British English|date=June 2015}}
{{Infobox political party
| name = Socialist Unity
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| colorcode = red
| abbreviation = SU
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| founded = {{start date|1977||}}
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| dissolved = {{end date|1979||}}
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| ideology = Socialism
Trotskyism
| position = Far-left
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| affiliation1_title = Coalition members
| affiliation1 = International Marxist Group
Workers League
Big Flame
Marxist Worker
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| state = the United Kingdom
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Socialist Unity was a small socialist electoral coalition in the United Kingdom. It was formed by the International Marxist Group (IMG) as a response to the Socialist Workers Party (SWP) standing candidates in elections.Sean Matgamna, "[http://www.workersliberty.org/story/2009/07/08/we-were-saying-left-and-labour-lessons-1979-general-election The Left and Labour: Lessons from the 1979 General Election ("As We Were Saying")]", Workers Liberty, 8 July 2009
Initially, in 1977, the IMG formed local groups, and then the national Socialist Unity grouping. They suggested an alliance with the SWP, which was rejected. The coalition attracted the support of the Workers League, Big Flame, the Marxist Worker group, and some independent socialists. The Workers League, Marxist Worker and the remnants of the Libertarian Communist Group were absorbed by the IMG and Big Flame around this time.
The group stood six candidates in the 1979 UK general election, including Tariq Ali. None of the candidates secured a contested seat. The coalition was dropped when the IMG decided to seek to influence the Labour Party instead.