国家防卫军（德语：Reichswehr）指1919年至1935年魏玛共和国的正规武装力量，它下辖有陆军、海军和秘密设立的空军。第一次世界大战结束后，根据协约国提出的《凡尔赛条约》，德国仅保有一支规模极小的军队，并在装备上有极为严格的限制。然而德**方为了未来的战事与重整军备，在人事、战术与装备上加以训练和研究，成了当时世界上平均素质最高的一支军队。存在仅16年时间的国家防卫军由于纳粹党的掌权而被德国国防军所取代，在阿道夫·希特勒激进的重新武装政策下，德**队由原先的十万多人增长到数百万之多，而威玛时期的军官团则成了新德军的核心领导层，造就了后来二战爆发后，德军于初期的高素质与节节胜利。

The Reichswehr (English: Imperial Defence) formed the military organization of Germany from 1919 until 1935, when it was united with the newly founded Wehrmacht ("Defence Force").

At the end of World War I, the forces of the German Empire had mostly split up, the men making their way home individually or in small groups. Many of them joined the Freikorps ("Free Corps"), a collection of volunteer paramilitary units that were involved in revolution and border clashes between 1918 and 1923.