This study examined electoral violence and democratic consolidation in Nigeria's Fourth Republic, with particular emphasis on the post-election crises that have characterized the country's democratic experience since 1999. Specifically, the study investigated the causes of electoral violence, assessed its implications for democratic consolidation, and evaluated the effectiveness of electoral reforms and conflict management mechanisms in mitigating post-election crises. A qualitative research design was adopted, relying exclusively on secondary data obtained from peer-reviewed journal articles, books, election reports, policy documents, newspaper publications, and reports of the Independent National Electoral Commission (INEC), civil society organizations, and international development agencies. Data were analyzed using thematic content analysis. The findings revealed that weak electoral institutions, political elite manipulation, poverty, unemployment, ethnic and religious divisions, and ineffective security management constitute the major drivers of electoral violence in Nigeria. The study further established that electoral violence undermines democratic consolidation by eroding public confidence in democratic institutions, discouraging political participation, weakening electoral credibility, and fostering political instability. Although recent electoral reforms, including the introduction of electronic voter accreditation and the electronic transmission of election results, have enhanced electoral transparency, their effectiveness has been constrained by implementation challenges, political interference, and institutional weaknesses. The study concludes that sustainable democratic consolidation in Nigeria depends on credible elections, strong and independent electoral institutions, impartial security agencies, adherence to the rule of law, and inclusive governance. It recommends strengthening the autonomy of electoral institutions, prosecuting electoral offenders, promoting youth empowerment and civic education, enhancing voter education programmes, and implementing sustained democratic and governance reforms. The study contributes to the growing body of literature on electoral violence and democratic governance by highlighting the institutional reforms necessary for promoting peaceful elections and democratic stability in Nigeria.