From 2014 to 2017, the M5S was a member of the Europe of Freedom and Direct Democracy group in the European Parliament, along with the UK Independence Party and minor Eurosceptic parties. In January 2017, M5S members voted in favour of Grillo's proposal to join the Alliance of Liberals and Democrats for Europe group but the party was eventually refused, and has since sat as Non-Inscrits in the European Parliament. In July 2024, the M5S applied to join The Left in the European Parliament – GUE/NGL.