The Lisbon Treaty, which entered into force in 2009, considerably reinforced the powers of the European Parliament. This article examines to what extent the European Parliament has become an important actor in EU counter-terrorism by focusing on the external dimension of this policy. It also analyses the impact that this potentially changing role has had on the external dimension of EU counter-terrorism. This article puts forward two inter-related claims. Firstly, the role of the European Parliament in the external dimension of EU counter-terrorism has significantly grown in recent years. Following the entry into force of the Lisbon Treaty in December 2009, the European Parliament has become a fully-fledged actor in the external dimension of EU counter-terrorism. Secondly, the reinforcement of the role of the European Parliament has also led to a strengthening of both accountability and oversight in the external dimension of EU counter-terrorism, although there are still some limitations in that respect.