> All of the three main branches of Christianity in the East (Eastern Orthodox Church, Oriental Orthodox Church and Church of the East) had always identified themselves as Catholic in accordance with Apostolic traditions and the Nicene Creed. Anglicans, Lutherans, and some Methodists also believe that their churches are "Catholic" in the sense that they too are in continuity with the original universal church founded by the Apostles. However, each church defines the scope of the "Catholic Church" differently. For instance, the Roman Catholic, Eastern Orthodox, Oriental Orthodox churches, and Church of the East, each maintain that their own denomination is identical with the original universal church, from which all other denominations broke away.

- https://en.wikipedia.org/wiki/Catholic_(term)

Greek Orthodox are "Catholic" but they are not "Roman Catholic".