Can the adhan be recited in a language other than Arabic?

The adhan, whose wording has been established by the Sunnah of the Prophet Muhammad (peace be upon him), is a symbol of Muslim presence and identity wherever in the world it is proclaimed. There is a 15-century-old tradition and consensus that the adhan should be recited in the original form as it was revealed and practiced by the Prophet (peace be upon him). Since the main purpose of the adhan is to announce the time and invite people to prayer, delivering this call to all Muslims who speak different languages is only possible by addressing their shared consciousness, which is achieved by reciting the adhan in its original wording, that is, in Arabic. (Ibn Abidin, Radd al-Muhtar, 1/383) Therefore, it is not permissible to recite the adhan in any language other than its original form.

Source: T.C. Diyanet İşleri Başkanlığı, Din İşleri Yüksek Kurulu