standardised model nomenclature in the early 1990s, whereby model names were the same in all markets regardless of the marque they were sold under.

As of 2021, there have been six generations of the Astra (or eleven generations of the Kadett/Astra family as a whole). In a fashion typical for Opel, they are designated with subsequent letters of the Latin alphabet. Opel's official convention is that the Astra is a logical continuation of the Kadett lineage, thus, the first generation of Opel Astra