Abstract The European Union is one of the best examples of regional integration frameworks in the world. In the current essay, the author examined this organisation from the perspective of the European Court of Justice. The legal institution is outlined as an example of how neo-institutionalism can improve and accelerate the process of integration. Two policies formulated and implemented by the European Union were examined with respect to their compatibility with laws from individual states. The European Court of Justice has adjudicated on disputes relating to environmental and social policies associated with the EU. The rulings made in these disputes helped create a new policy for the union. To this end, the court of justice was analysed on the basis of neo-institutionalism in relation to regional integration. Introduction History of the European Court of Justice The European Court of Justice (ECJ) is well understood against the background of the European Union. The desire to come up with a judicial institution to address disputes relating to the coming together of the European states was first developed in the aftermath of the Second World War (Rosas 2013). The establishment of such a monumental institution is associated with the existence of other equally reputable organisations like the Supreme Courts established in various countries. The motivation behind the formation of ECJ notwithstanding, it is noted that justice is a universal requirement for the existence of any civilised society. The ECJ acts as the court of last resort with respect to the various disagreements reported among the European Union’s member states. In Europe, justice is seen to be dispensed only in a court that has the requisite legal competencies. As such, judicial institutions in this region are required to meet a high threshold for them to be acceptable. According to Rosas (2013), the establishment of the ECJ is termed by many scholars as one of the major legal revolutions in history. Europe is an expansive continent. In light of this, the court appeared to set a precedent in the adjudication of cases involving parties drawn from different member states. The court derives its ‘universal court of appeal’ status from the papal courts of the Middle Ages. The EU law brings about the need to transcend beyond nationalism to what is envisioned as supranationalism . As such, the court has to operate as an overseer of legal justice in all the member states. The judicial agency has evolved significantly over time. It has undergone a number of turbulent scenarios, some of which threatened its existence. However, as is the norm with other courts of law around the world, ECJ relies mostly on precedents to adjudicate on disputes brought before it. According to Arnull (2006), the court is a key component of the European Union. It plays a very critical role with respect to the enactment of laws that foster harmony within the regional bloc. The exact role of ECJ with regards to integration is highlighted more in this essay. European Union: The Integration Process In the current essay, the author analyses the amalgamation process from the perspective of a region with countries keen on forging a common interest. Rosas (2013) is of the view that regional integration