The Schumacher Institute for Sustainable Systems is a UK-based think tank focused on promoting sustainability, social justice, and environmental stewardship. It was founded in 1983 and is named after E.F. Schumacher, an economist known for his work on sustainable development and human-scale economics. The institute aims to challenge mainstream economic models by advocating for systems thinking—looking at interconnectedness across various fields like ecology, economics, and society.

The institute conducts research and provides education on sustainability, focusing on areas such as energy, climate change, social equity, and economic systems. It also works to influence policy and promote practices that encourage long-term environmental sustainability and human well-being. Through its publications, conferences, and collaborations with other organizations, the Schumacher Institute encourages transformative change in both local and global contexts.