In recent decades, an important field of research has emerged concerning the careers of Members of the European Parliament. Due to the specific nature of the European Parliament, the European Union, the multilevel politics and the peculiarity of the supranational political class, it is of particular interest to map and control the regularity of, and changes in, the composition of the European Parliament and the impact over systemic features or policy-making aspects. For this reason, the article presents a new dataset comprising a collection of detailed information about all of the Members of the European Parliament who held office from the first election in 1979 until the latest in 2019. This dataset represents a useful novelty because it is a dynamic tool that allows reconnecting the Members of the European Parliament’s position and responsibilities within the European Parliament to their political background before entering the supranational assembly. Finally, the article suggests possible fields of research in which this type of data could be useful in deepening and consolidating our knowledge about the European Parliament and its members.