装步战车（Infantry fighting vehicle-IFV，或译作步兵战斗车）也称机械化步兵战车（MIFV），简称步战车。是一种能搭载步兵，并能伴随步兵提供火力支持的装甲运输车辆。在很多时候，步战车对于步兵的支持甚至比主战坦克所能提供的还要多。

步战车和装甲运兵车作用相近，都是运送大约一个小队的步兵（人数大约在5-10人之间），步兵战斗车与装甲运兵车不同的地方在于，步兵战斗车的防护力较好，火力较大，能够让步兵乘车作战，本身也能够伴随下车作战的步兵，提供直接的火力支持。装甲运兵车则更接近于有装甲的运输车辆。仅具备基本的自卫火力。

An infantry fighting vehicle (IFV), or mechanized infantry combat vehicle (MICV), is a type of armoured fighting vehicle used to carry infantry into battle and provide direct fire support. The Treaty on Conventional Armed Forces in Europe defines an infantry fighting vehicle as "an armoured combat vehicle which is designed and equipped primarily to transport a combat infantry squad, which is armed with an integral or organic cannon of at least 20 millimeters calibre and sometimes an antitank missile launcher."