This work examined some of the threats confronting Nigeria`s national unity. It also examined some of the possible alternatives needed to be adopted in order to reposition the country towards sustainable national unity. Descriptive analysis was adopted in this research. Qualitative method of data collection was utilized by the Researchers. Secondary based data sourced from journal articles, magazines, newspapers, bulletins, lecture notes, diaries, as well as internet based information were used by the Researchers. Religious intolerance, internal conflicts as well as over centralization of power and resources as the Researchers found out are some of the threats confronting Nigeria`s national unity. Decentralization of power and resources to the federated unions as the Researchers recommended are part of the alternatives needed to re-position Nigeria towards sustainable national unity.