Fabio Massimo Castaldo (born 18 September 1985) is an Italian politician who has served in the European Parliament since 2014.

[3] Castaldo was re-elected in the 2019 European Parliament election in Italy.

[4] On 3 July 2019, he was re-elected vice-president of the European Parliament, running as an independent with the support of over forty MEPs belonging to various political groups, as the European delegation of the Five Star Movement (M5S) belonged to the technical grouping of the Non-Inscrits.

[citation needed] His election represented the second success of an independent candidate following the 2009 election of Edward McMillan-Scott, who was elected with the Conservative Party and sat with European Conservatives and Reformists (ECR) but successfully stood as an independent candidate against ECR's official candidate and was expelled; although he joined the Liberal Democrats, McMillan-Scott sat as a non-attached MEP.

[5] In July 2023, he denied rumours that he would switch to Forza Italia of the European People's Party on the grounds that M5S leader Giuseppe Conte allegedly excluded him for the list of candidates for the 2024 European Parliament election in Italy.