The European Conservatives and Reformists (ECR) is a Eurosceptic, anti-federalist political group of the European Parliament. The ECR is the parliamentary group of the European Conservatives and Reformists Party (ECR Party) European political party (formerly known as the Alliance of Conservatives and Reformists in Europe (2016–2019) or Alliance of European Conservatives and Reformists (2009–2016), but also includes MEPs from four other European parties and thirteen MEPs without European party affiliation.

Ideologically, the group is broadly eurosceptic, anti-federalist and right-wing. The main objective of the ECR is to oppose unchecked European integration, enlargement and potential evolution of the European Union (EU) into a Federal European Superstate on the basis of Eurorealism, and to ensure the EU does not heavily encroach on domestic and regional decision making within EU member states. It also advocates for free market policies and stricter controls on immigration. The ECR contains factions of socially conservative, right-wing populist, liberal conservative, Christian democrat, nationalist and national conservative parties who all subscribe to an anti-federalist and eurorealist or euro-critical stance.