The ranking, which assesses universities across the UK based on their environmental and ethical performance, also named University of Brighton as the fourth most sustainable university in the South East.
The People & Planet assessment covers 14 categories, including environmental policy and strategy, water use, waste and recycling, carbon management and reduction, as well as education for sustainable development.
Brighton was awarded a perfect score (100%) for its sustainability strategy and policies, and also scored highly for Staff and Student Engagement (90%), Education for Sustainable Development (85%) and Carbon Management (83%).