格（又称镡、护手、剑首、剑口、剑鼻或剑环；英语：Crossguard或Cross-guard、Quillons）为剑的一部份，位于剑身与剑柄之间，主要目的为保护持有者的手。

On a sword, the crossguard, or cross-guard, also known as quillons, is a bar of metal at right angles to the blade, placed between the blade and the hilt. The crossguard was developed in the European sword around the 10th century for the protection of the wielder's hand. The earliest forms were the crossguard variant of the Spatha used by the Huns, the so called Pontic swords. The crossguards were not only used to counter enemy attacks, but also to get a better grip on the sword. They were later seen in late Viking swords, and is a standard feature of the Norman sword of the 11th century and of the knightly arming sword throughout the high and late medieval period. Early crossguards were straight metal bars, sometimes tapering towards the outer ends. While this simple type was never discontinued, more elaborate forms developed alongside it in the course of the Middle Ages. The crossguard could be waisted or bent in the 12th and 13th century.