钩针是针的一种，在末端有一个钝勾子（形状类似豆苗刚发芽时的芽头），透过勾子在线圈中的旋转来进行钩针编织，通常与棒针名列两大手工针织工具，最早的钩针使用可能是18世纪或19世纪晚期，制造钩针的材料有木头、塑胶、金属或酪蛋白（en:casein；也常用于钢笔制造）。钩针的把柄在早期都像银制餐具一样具有一些装饰，有时把柄的材料和针头的材料也不相同。有些是金属针头、木头把柄；有些则是塑胶把柄、金属针头。

钩针的种类在现在也发展出很多种，常见的有双头的金属钩针（Cro-hook），与较长的突尼斯钩针，另外也有专门编织圆筒形状的线形钩针（头尾中间是可弯曲的金属线）。

A crochet hook (or crochet needle) is an implement used to make loops in thread or yarn and to interlock them into crochet stitches. It is basically a round shaft pointed on one end, with a lateral groove behind it. The point eases the insertion of the hook through the material being crocheted and the groove makes it possible to pull a loop back through the material. The shaft is then divided into a working area that determines the hook's nominal diameter and ensures the uniform sizing of the loops formed on it, and a handle.