One of the main goals of the Second Vatican Council (the 50th anniversary of whose opening will be celebrated in 2012) was the unity of all Christians. Not least among its achievements was the fact that it launched the Catholic Church into the Ecumenical Movement and also paved the way for a global revision of the Church’s Code of Canon Law. This article reflects from a Roman Catholic perspective on aspects to do with canon law and ecumenism. It does so in the light of the Council’s teaching and reception. Conciliar hermeneutics and questions left open at the Council are considered. In conclusion, the author suggests that greater attention to the Church’s charismatic principle and missionary mandate underlined at the Council offers wide scope for continuing exploration among Anglican and Roman Catholic canonists in the cause of unity.