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Wynn (Ƿ ƿ) (also spelled wen, ƿynn, or ƿen) is a letter of the Old English alphabet, where it is used to represent the sound /w/.
While the earliest Old English texts represent this phoneme with the digraph ⟨uu⟩, scribes soon borrowed the rune wynn ᚹ for this purpose. It remained a standard letter throughout the Anglo-Saxon era, eventually falling out of use (perhaps under the influence of French orthography) during the Middle English period, circa 1300. It was replaced with ⟨uu⟩ once again, from which the modern <w> developed.
It is one of the two runes (along with þ) to have been borrowed into the English alphabet (or any extension of the Latin alphabet). A modified version of the letter ƿynn called Vend was used briefly in Old Norse for the sounds /u/, /v/, and /w/.
As with þ, ƿynn was revived in modern times for the printing of Old English texts, but since the early 20th century the usual practice has been to substitute the modern ⟨w⟩ because of ƿynn's visual resemblance to P.