水结（英语：Water knot）是一种常用于攀爬时连接两绳带两端的绳结，例如吊带。

水结的组成元素是反手结。先将一绳端绑成反手结，第二条绳带再顺着其路径反方向做反手结，两条带子应俐落地对齐并系紧。绳带末端应留至少3英吋（约7.6公分）长，结由全身体重系紧才算完备。绳端可粘贴或稍微缝上支撑的部分避免缩入绳结内。

The water knot (also tape knot, ring bend, grass knot, or overhand follow-through) is a knot frequently used in climbing for joining two ends of webbing together, for instance when making a sling.