Oe or barred O (è é; italics: <span style="font-family: times, Times New Macedonia, serif; font-size: larger">è é</span>) is a letter of the Cyrillic script.
Its form was copied from the Latin letter barred O (àõ) used in JaêÂÂalif and other alphabets.
Despite having a similar shape, it is related neither to the Greek letter theta (àø/) nor to the archaic Cyrillic letter fita (ò ó).
Oe is used in the alphabets of the Bashkir, Buryat, Kalmyk, Karakalpak, Kazakh, Komi-Yazva, Kyrgyz, Mongolian, Sakha, Selkup, Tatar and Tuvan languages.
In Turkic languages, it commonly represents the front rounded vowels // or //. In Kazakh and Karakalpak, it may also express //. In Mongolic languages, it usually represents // or //. The letter has also been adopted in the spelling of the Komi-Yazva language, where it represents a close-mid centralized back unrounded or weakly rounded vowel //. In Kyrgyz, Mongolian and Tuvan, the Cyrillic letter can be written as a double vowel.
Until a new alphabet was published in 2016, Oe was used to represent // in Negidal.
Oe is most commonly romanized as ; but its ISO 9 transliteration is . In 2018, there were proposals to use as a romanization of Oe in Kazakh, but a year later it was certified as .
The International Phonetic Alphabet uses the identically shaped Latin counterpart, õ, to represent the close-mid central rounded vowel, and sometimes also the mid central rounded vowel.