The Sahel region of Tanzania is facing significant challenges due to climate change, impacting human security in various dimensions. A participatory action research approach was employed, involving local communities, government officials, and researchers for data collection and analysis. The study identified a 30% increase in crop failure frequency over five years due to erratic rainfall patterns. Climate change exacerbates existing vulnerabilities in the Sahel region of Tanzania, particularly affecting food security and livelihoods. Immediate measures are needed to enhance agricultural resilience through improved irrigation systems and diversified farming practices. climate change, human security, Sahel, Tanzania