纳粹飞碟（英语：Nazi UFO），是一种知名的都市传奇之一，在第二次世界大战期间，希特勒想对付盟军令纳粹德国扭转败局，下令纳粹德国科学家秘密研制的一种圆碟形状的飞行器，然而目前所有传说内容全无可信证据证明曾经存在过，也没有任何国家官方证实，皆处于历史传说或都会传说色彩，科学界较为可能的推测是曾有盟军人员看到纳粹研发机构中有一些圆形零件而又被告知与飞行实验有关，其实可能是类似直升机研发计划的产物，经过大量穿凿附会成为飞碟传说。

此理论曾被Discovery拍成纪录片《真实的飞碟》，而科幻电影铁幕苍穹也以此为主线。

In UFOlogy, conspiracy theory, science fiction, and comic book stories, claims or stories have circulated linking UFOs to Nazi Germany. The German UFO theories describe supposedly successful attempts to develop advanced aircraft or spacecraft prior to and during World War II, and further assert the post-war survival of these craft in secret underground bases in Antarctica, South America, or the United States, along with their creators. According to these theories and fictional stories, various potential code-names or sub-classifications of Nazi UFO craft such as Rundflugzeug, Feuerball, Diskus, Haunebu, Hauneburg-Gerät, V7, Vril, Kugelblitz (not related to the self-propelled anti-aircraft gun of the same name), Andromeda-Gerät, Flugkreisel, Kugelwaffe, and Reichsflugscheibe have all been referenced.