拒马是机动式路障的一种。

在中国古代架起长枪或与木柱搭配作成障碍物用以防御敌方骑兵的进攻，称为「拒马枪」。三支交干相贯，以铁为索固定的为「远驮固营拒马枪」。横一大木，大木长短不一，上穿九至十支铁枪，称作「近守拒马鹿角枪」。类似的防御工事在西方亦有。

现代的拒马则改为由铁架与铁丝网所组成，故又称为「铁拒马」，用途也更为广泛。除了在军事上的使用外，在镇暴维安行动上也会使用，有隔离及阻挡人车的作用。而且现代的拒马有些还设计有走轮，机动性强，2～4人即可在极短的时间内架设完成。但因重量较轻，所以有时还会加钉短桩于地上。

The cheval de frise (plural: chevaux de frise) was a medieval defensive anti-cavalry measure consisting of a portable frame (sometimes just a simple log) covered with many projecting long iron or wooden spikes or spears. They were principally intended as an anti-cavalry obstacle but could also be moved quickly to help block a breach in another barrier. They remained in occasional use until they were replaced by wire obstacles just after the American Civil War. During the Civil War, the Confederates used this type of barrier more often than the Union forces. During World War I, armies used chevaux de frise to temporarily plug gaps in barbed wire. Chevaux de frise of barbed wire were used in jungle fighting on south Pacific islands during World War II.