Free, Prior and Informed Consent (FPIC) is a principle that indigenous communities have the right to give or withhold consent to projects that may affect their lands. It involves meaningful participation and decision making according to customary systems. FPIC is relevant for projects involving infrastructure, natural resources and research. When implemented properly, it can help communities negotiate benefits and block unacceptable projects. However, ensuring FPIC is implemented fairly presents challenges around power balances, representation, and verification. Carbon projects should fully incorporate FPIC principles to respect land rights and ensure equitable benefit sharing.