攻角（英语：Angle of attack，缩写为AOA，常用希腊字母α表示）为一空气动力学名词，为机翼之翼弦与自由流（或是相对风流的方向）之夹角；如为飞机攻角，定义则为机轴对相对风流之夹角。当机翼向上为正攻角，向下则为负攻角。

它有可能与俯仰角搞混。俯仰角是指翼弦与飞行器俯仰之夹角，而攻角是指与自由流之夹角。

机翼要有升力，则必须要有攻角或是弧度（camber）。有弧度的机翼，其零升力攻角不为零，也就是在攻角0度时，有弧线的机翼就有升力。而对称翼不具弧线，所以在攻角0度时没有升力，必须要有攻角，机翼才能提供升力。

In fluid dynamics, angle of attack (AOA, or (Greek letter alpha)) is the angle between a reference line on a body (often the chord line of an airfoil) and the vector representing the relative motion between the body and the fluid through which it is moving. Angle of attack is the angle between the body's reference line and the oncoming flow. This article focuses on the most common application, the angle of attack of a wing or airfoil moving through air.