You can help expand this article with text translated from the corresponding article in German. (September 2017) Click for important translation instructions. View a machine-translated version of the German article. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing German Wikipedia article at :de:Revolutionär Sozialistischer Bund/Vierte Internationale; see its history for attribution. You may also add the template {{Translated|de|Revolutionär Sozialistischer Bund/Vierte Internationale}} to the talk page. For more guidance, see Wikipedia:Translation.

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The Revolutionary Socialist League (German: Revolutionär Sozialistischer Bund, RSB) was a small Trotskyist group in Germany. It was formed in 1994 as a split from the Association for Solidarity Perspectives (VsP). The RSB generally considered itself to be more radical than the VsP, and unlike the VsP it is very critical of the Left Party. Along with the International Socialist Left, the RSB was one of the two factions which form the German section of the Fourth International.

It published the monthly magazine Avanti.

In December 2016, the RSB and the ISL announced that they had merged to form the new International Socialist Organisation.^[1]

• (in German) RSB website
• (in German) ISO website

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