Ue or Straight U (Ү ү; italics: Ү ү) is a letter of the Cyrillic script. It is a form of the Cyrillic letter U (У у У у) with a vertical, rather than diagonal, center line. Whereas a standard Cyrillic U resembles a lowercase Latin y, Ue instead uses the shape of a capital Latin Y, with each letter set higher or lower to establish its case. The lower case resembles the lower case of the Greek letter gamma.

Ue is in used the alphabets of the Tuvan, Bashkir, Buryat, Kalmyk, Kazakh, Kyrgyz, Mongolian, Sakha, Turkmen, Tatar and other languages. It commonly represents the front rounded vowels /y/ and /ʏ/ in most Turkic languages, except in Mongolian where it represents /u/.

In Tuvan and Kyrgyz the Cyrillic letter can be written as a double vowel.