B-2“幽灵”（英语：Spirit）是目前世界上唯一的匿踪战略轰炸机，于1981年10月20日打败洛克希德／洛克威尔，由诺斯洛普／波音团队赢得ATB（The Advanced Technology Bomber）计划，在麻省理工学院科学家协助之下为美国空军研制生产。1997年，首批六架B-2轰炸机正式服役，而至今一共只生产21架。在F-117A夜鹰攻击机退役，F-35闪电II式战斗机尚未服役之时，B-2与F-22猛禽式战斗机为目前世界上仅有可以进行对地攻击任务的匿踪型机种。每架B-2造价为24亿美元，若以重量计，B-2的重量单位价格比黄金还要贵两至三倍（最初装备时）。

The Northrop (later Northrop Grumman) B-2 Spirit, also known as the Stealth Bomber, is an American heavy penetration strategic bomber, featuring low observable stealth technology designed for penetrating dense anti-aircraft defenses; it is a flying wing design with a crew of two. The bomber can deploy both conventional and thermonuclear weapons, such as eighty 500 lb (230 kg)-class (Mk 82) JDAM Global Positioning System-guided bombs, or sixteen 2,400 lb (1,100 kg) B83 nuclear bombs. The B-2 is the only acknowledged aircraft that can carry large air-to-surface standoff weapons in a stealth configuration.