Nigeria has faced persistent threats from terrorist groups such as Boko Haram, Islamic State West Africa Province (ISWAP), and various armed militias, posing serious challenges to national security, political stability, and socio-economic development. Over the years, the Nigerian government has adopted a range of counter-terrorism strategies, including military offensives, intelligence gathering, deradicalization programmes, community engagement initiatives, and legislative frameworks such as the Terrorism (Prevention) Act. This study critically evaluates the effectiveness of these strategies by examining their implementation, outcomes, and limitations. Drawing on qualitative and quantitative data from security reports, policy documents, and scholarly analyses, the research assesses the extent to which these measures have reduced terrorist activities, improved security, and addressed underlying socio-economic drivers of extremism. Findings indicate that while military operations have weakened some terrorist networks and reclaimed territories, challenges remain in areas such as inter-agency coordination, respect for human rights, corruption, and insufficient attention to root causes like poverty, unemployment, and political marginalization. The paper concludes that a more integrated, intelligence-driven, and community-based approach complemented by socio-economic reforms is essential for sustainable counter-terrorism success in Nigeria.