The Climate Group is a non-profit organization that works with business and government leaders around the world to address climate change. The group has programs focusing on renewable energy and reducing greenhouse gas emissions. Launched in 2004, the organization operates globally with offices in the UK (headquarters), the United States and India.

It acts as the secretariat for the Under2 Coalition, an alliance of state and regional governments around the world that are committed to reducing their greenhouse gas emissions to net-zero levels by 2050.As of 2017, the Under2 Coalition brings together over 205 governments from 43 countries, representing 1.3 billion people and almost 40% of the global economy.

The organization's business initiatives "RE100", "EP100" and "EV100", which are run as part of the We Mean Business coalition, aim to grow corporate demand for renewable energy, energy productivity and electric transport, accelerating the transition to a zero-emissions economy, while helping leading businesses to reduce carbon emissions, be more resilient and increase profits.