Turkish (Türkçe (listen), Türk dili), also referred to as Istanbul Turkish (İstanbul Türkçesi) or Turkey Turkish (Türkiye Türkçesi), is the most widely spoken of the Turkic languages, with around 70 to 80 million speakers. It is the national language of Turkey. Significant smaller groups of Turkish speakers exist in Iraq, Syria, Germany, Austria, Bulgaria, North Macedonia, Northern Cyprus, Greece, the Caucasus, and other parts of Europe and Central Asia. Cyprus has requested that the European Union add Turkish as an official language, even though Turkey is not a member state.

To the west, the influence of Ottoman Turkish—the variety of the Turkish language that was used as the administrative and literary language of the Ottoman Empire—spread as the Ottoman Empire expanded. In 1928, as one of Atatürk's Reforms in the early years of the Republic of Turkey, the Ottoman Turkish alphabet was replaced with a Latin alphabet.

The distinctive characteristics of the Turkish language are vowel harmony and extensive agglutination. The basic word order of Turkish is subject–object–verb. Turkish has no noun classes or grammatical gender. The language makes usage of honorifics and has a strong T–V distinction which distinguishes varying levels of politeness, social distance, age, courtesy or familiarity toward the addressee. The plural second-person pronoun and verb forms are used referring to a single person out of respect.