The hyphen ‐ is a punctuation mark used to join words and to separate syllables of a single word. The use of hyphens is called hyphenation. Son-in-law is an example of a hyphenated word.

The hyphen is sometimes confused with dashes (en dash – and em dash — and others), which are longer, or with the minus sign −, which is also longer and usually higher up to match the crossbar in the plus sign +.

As an orthographic concept, the hyphen is a single entity. In character encoding it is represented by any of several characters and glyphs, including the Unicode hyphen (shown at the top of the infobox on this page), the hyphen-minus, the soft hyphen, and the nonbreaking hyphen. The character most often used to represent a hyphen (and the one produced by the key on a keyboard) is called the "hyphen-minus" by Unicode, deriving from the original ASCII standard, where it was called "hyphen (minus)".