大氣結冰（）是指當與物體連結的水滴在空氣中結冰。這種情形對於航空器來說非常危險，因為結冰的部份可能會改變機體表面的空氣動力學，並會造成升力的降低，甚至導致墜機。
並非所有的水都是在攝氏0°C（或華氏32°F）結冰。低於這個溫度的液態水被稱為過冷（supercooled），而正是這些過冷的水滴造成航空器的結冰問題。但低於零下20°C時卻少有結冰情形，原因是在這樣的溫度下，雲中包含的是冰的微粒，而非水滴。
大氣結冰也會發生在高塔、風力機、鑽油平台、船隻、樹木等，會和低溫及水滴接觸的其他物體上。
相關條目
*除冰
參考文獻
#FAA (U.S.) [https://web.archive.org/web/20070311160551/http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/0/F5BD7904E845409D862569AE00783347?OpenDocument Advisory Circular 20-113]: Pilot Precautions and Procedures to be taken in Preventing Aircraft Reciprocating Engine Induction System and Fuel System Icing Problems
#FAA (U.S.) [https://web.archive.org/web/20070311160530/http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/0/A6B4EB947B007B3C862569BD006871B5?OpenDocument Advisory Circular 20-117]: Hazards Following Ground Deicing and Ground Operations in Conditions Conducive to Aircraft Icing
#FAA (U.S.) [https://web.archive.org/web/20070311160542/http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/0/9F369F487492E0CD86256E31006C881C?OpenDocument Advisory Circular 20-147]: Turbojet, Turboprop, and Turbofan Engine Induction System Icing and Ice Ingestion
#[https://web.archive.org/web/20070311014551/http://virtual.vtt.fi/virtual/arcticwind/experience.htm Wind Energy in Cold Climates]: Icing on wind turbines
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