This article considers legislative approaches to online disinformation in the European Union (EU) and identifies how shifting approaches could undermine applicable fundamental rights standards in the disinformation field. The problem of online disinformation – and its disruptive effects on European elections – has attracted extensive scrutiny at the EU institutional and Member State level. Since 2018, Union institutions have pursued self-regulatory measures for disinformation and have explicitly refrained from including this content in the EU’s intermediary liability regime. A key justification for this approach has been that disinformation generally includes lawful content and that restrictions on lawful content may undermine the right to freedom of expression. As this article maps, however, standards are shifting in the EU legal context regarding online intermediary responsibilities to limit the dissemination of content containing disinformation. This is not only evidenced by a diverse set of Member State laws designed to address misleading electoral communications, but also in several provisions of the Digital Services Act (DSA) which have potential applications in this area. Drawing from relevant case law of the Court of Justice of the European Union (CJEU) and the European Court of Human Rights (ECtHR), this article provides a distillation of key European standards regarding how EU and Member State laws to combat disinformation must ensure compatibility with the right to freedom of expression. This article further considers whether – in light of these standards – divergent legislative approaches to online disinformation in the EU could undermine fundamental rights.