Piracy has become a serious problem in Nigeria's territorial waters that is negatively impacting the country's economy. Pirates target vessels carrying oil and gas, reducing the country's revenue. They also attack fishing boats, decreasing employment. This paper examines the root causes and effects of piracy in Nigeria, as well as challenges in suppressing it. It argues that Nigeria must expand its legal definition of piracy to include armed robbery in its waters. It also says Nigeria must criminalize piracy domestically to prosecute pirates in its courts. Suppressing piracy will require political will, regional cooperation, and addressing issues that fuel militancy in the Niger Delta region.