The discovery of oil in the Niger Delta in 1956 brought hope of rapid socio-economic development of the region. No one knew of the ruinous environmental pollution that was to accompany oil activities. Thus, the euphoria of access to easy petro-dollar that enveloped the region’s people was devoid of any apprehension. However, oil activities in the region have been accompanied by huge gas flaring and unabated oil spillages. Their negative impacts have brought about physical and ecological changes on the environment. This study examines crude oil activities in the Niger Delta and their effects on the environment. It intently examines the nexus between effects of oil activities on the environment and food insecurity in the Niger Delta. The study deployed both qualitative and quantitative research methodologies for data collection, analysis and presentation. The data for this study were collected using triangulation; structured close-ended questionnaire schedule, focus group discussions and open-ended target interviews. The paper found that pollution from oil exploration and exploitation activities have acutely impacted the Niger Delta environment with deleterious impact on flora and fauna. It concludes that impacts of oil on the environment have gravely impaired food security in the Niger Delta.