韵律（意大利语：Metrica，法语：Métrique，德语：Metrik，英式英文：Metre，美式英文：Meter，原于希腊语：μέτρον）是西方诗歌中韵文的基本用韵结构。一行诗（line）可以被分成几组音步（foot）。一组韵脚通常遵循弱强（Iamb／iambic），强弱（Trochee／trochaic），强弱弱（Dactyl／dactylic），弱弱强（Anapest／anapestic），强强（Spondee）或者弱弱（Pyrrhic）这几种形式，也可以混着用。需要划分英文诗歌的韵脚时，一般用声调符号来标注强弱。一个升调“á”（类似中文拼音里的二声）表示强，一般一个朝上的小圆弧“ă”（类似三声的记号）表示弱，叉“×”或者圆圈“°”也有被使用（表示弱）。有时候诗里会出现一个落单的、无法归入其他韵脚的音节，这称为不完美韵脚（Imperfect foot）。一行诗里的韵脚数和韵脚的形式被统称为韵律。根据数目划分，常用韵律有八类，分别为：

In poetry, metre (meter in US spelling) is the basic rhythmic structure of a verse or lines in verse. Many traditional verse forms prescribe a specific verse metre, or a certain set of metres alternating in a particular order. The study and the actual use of metres and forms of versification are both known as prosody. (Within linguistics, "prosody" is used in a more general sense that includes not only poetic metre but also the rhythmic aspects of prose, whether formal or informal, that vary from language to language, and sometimes between poetic traditions.)