碳收集及保存（Carbon capture and storage，简称CCS，又译为碳封存、碳捕集及保存或碳捕获及封存等）是指将大型发电厂产生的二氧化碳收集，并用各种办法保存以避免其进入大气层的技术。这种技术是减慢全球变暖的一种方法。而商业上使用的二氧化碳收集方法已经沿用一段时间，手法已发展得颇为成熟。这一个技术流程，涉及捕集和分离二氧化碳、运输至保存地点并且长期与空气隔离。然而，长期保存二氧化碳的概念现时只是尚在构思阶段，至现时未有发电厂运作整套碳收集及保存的设施。 拥有整套碳收集及保存的设施的发电厂，比未有这种设施的发电厂减少八至九成的二氧化碳排放，但会耗用两至九成额外能源。

Carbon capture and storage (CCS) (or carbon capture and sequestration) is the process of capturing waste carbon dioxide (CO₂) from large point sources, such as fossil fuel power plants, transporting it to a storage site, and depositing it where it will not enter the atmosphere, normally an underground geological formation. The aim is to prevent the release of large quantities of CO₂ into the atmosphere (from fossil fuel use in power generation and other industries). It is a potential means of mitigating the contribution of fossil fuel emissions to global warming and ocean acidification. 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. The first commercial example was the Weyburn-Midale Carbon Dioxide Project in 2000. Other examples include SaskPower's Boundary Dam and Mississippi Power's Kemper Project. 'CCS' can also be used to describe the scrubbing of CO₂ from ambient air as a climate engineering technique.