近距离空中支援 （英文：Close Air Support，简称CAS）是一种由定翼机或旋翼机所进行的空中行动，属于近距离支援 的一种，对抗接近友方地面或海面部队的敌对目标。行动需要仔细整合各个部队的火力及移动。虽称“近距离”，但进行支援的空中部队可能与地面部队保持一段长距离。[ 1]
伊拉克战争 中，AH-64阿帕奇 为巡逻位于巴格达东南的底格里斯河 的美国陆军 士兵提供密接空中支援。2015年3月12日，美军第173空降旅503步兵团第二营B连的伞兵在斯洛文尼亚 波斯托克纳的波切克山脉进行近距离空中支援训练时，所观测到的美国空军F-16战隼战斗机 。 近距离空中支援需要与地面部队有精确的协调，而在先进的现代化军队中则有特别人员负责，如联合炮火观测员 （Joint Fires Observers ）、前进空中管制员 （F orward A ir C ontrollers ）——已于2003年改称联合终端攻击管制员 （J oint T erminal A ttack C ontrollers ）。
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