O with circumflex (О̂ о̂; О̂ о̂) is a character in the Cyrillic alphabet. The letter was created and in the most common version of the Udege language's alphabet: the Khabarovsk version, used for the northern dialects.[1][2] This letter has also been used historically in the Ukrainian language, and in some 19th-century publications in the Karelian language.[3]