This paper examines the role of Muslim religious organisations in northern Nigeria as religious interest groups in relation to government decision-making, including their role as ‘superior Muslim influence’ in the introduction and dissemination of Sharia law in 12 northern states in Nigeria. Two of the most prominent Muslim organisations in Nigeria, the J’amatu Nasril Islam (JNI) and Nigerian Supreme Council for Islamic Affairs (NSCIA), are examined in this regard to compare and highlight their lobbying strategies in their attempt to justify claims to representing over 80 million Muslims in Nigeria. This paper suggest that Islam and the support from Muslim organisations were significant influences on government policy-makers involved in the process of adopting Sharia law in the northern states. Overall, this paper concludes that Muslim organisations have superior influence, have significantly marginalised non-Muslims and have focused on Sharia law policy, thus enabling an analysis of the relationship between religion and politics in Nigeria.