A refrigerated container or reefer is a shipping container used in intermodal freight transport that is refrigerated for the transportation of temperature sensitive cargo.

While a reefer will have an integral refrigeration unit, they rely on external power, from electrical power points at a land based site, a container ship or on quay. When being transported over the road on a trailer they can be powered from diesel powered generators ("gen sets") which attach to the container whilst on road journeys.

Some reefers are equipped with a water cooling system, which can be used if the reefer is stored under deck on a vessel without adequate ventilation to remove the heat condition.

Water cooling systems are expensive, so modern vessels rely more on ventilation to remove heat from cargo holds, and the use of water cooling systems is declining.

The new "cryogenic" reefers are in service transporting frozen foodstuffs, but they have yet to gain wide acceptance (due, in part, to the cost of liquid carbon dioxide). Since cryogenic refrigeration is a proven technology and environmentally friendly, the rising price of fuel and the increased availability of carbon dioxide from Kyoto Protocol-induced capturing techniques may lead to common usage of cryogenic containers, especially in intermodal trade.

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