In verse, a foot is the basic unit of meter used to describe rhythm. A foot consists of a certain number of syllables forming part of a line of verse. A foot is described by the character and number of syllables it contains: in English, feet are named for the combination of accented and unaccented syllables; in other languages such as Latin and Greek, the duration of the syllable (long or short) is measured.

When scanning a line of verse, a poet looks at feet as the basic rhythmic unit rather than words. A foot can consist of multiple words and a single word can contain many feet; furthermore, a foot can and often does bridge multiple words, containing, for example, the last two syllables of one word and the first of the next. To scan for feet, one should focus on the stream of sound alone and forget that words exist at all.

For a list of metrical feet see meter (poetry).