Carbon capture and storage (CCS) or carbon capture and sequestration is the process of capturing carbon dioxide (CO₂) before it enters the atmosphere, transporting it, and storing it (carbon sequestration) for centuries or millennia. Usually the CO₂ is captured from large point sources, such as coal-fired power plant, a chemical plant or biomass power plant, and then stored in an underground geological formation.

The aim is to prevent the release of CO₂ from heavy industry with the intent of mitigating the effects of climate change. Although CO₂ has been injected into geological formations for several decades for various purposes, including enhanced oil recovery, the long-term storage of CO₂ is a relatively new concept. 

Carbon capture and utilization (CCU) and CCS are sometimes discussed collectively as carbon capture, utilization, and sequestration (CCUS). This is because CCS is a relatively expensive process yielding a product with an intrinsic low value (i.e. CO₂). Hence, carbon capture makes economically more sense when being combined with a utilization process where the cheap CO₂ can be used to produce high-value chemicals to offset the high costs of capture operations.