Quenya (pronounced [ˈkʷwɛnja]) is a fictional language devised by J. R. R. Tolkien, and used in his Secondary world, often called Middle-earth.

Quenya is one of the many Elvish languages spoken by the immortal Elves, called Quendi in Quenya. The tongue actually called Quenya was in origin the speech of two clans of Elves living in Eldamar ("Elvenhome"), the Noldor and the Vanyar. Quenya translates as simply "language", or in contrast to other tongues that the Elves met later in their long history "elf-language". In the Second Age the Wise of Númenor learned the Quenya tongue. In the Third Age, (the time of the setting of The Lord of the Rings) Quenya was no longer a living language for the Noldor of Middle-earth. Exilic Quenya was learned at an early age by all Elves of Noldorin origin, and it continued to be used in spoken and written form, but their mother-tongue was another Elven-tongue, Sindarin.

Tolkien began with devising the language at around 1910 and re-structured the grammar four times until Quenya reached its final state. The vocabulary however remained relatively stable throughout the creation process. Also the name of the language itself was repeatedly changed by Tolkien from Elfin and Qenya to the eventual Quenya. The Finnish language has been a major source of inspiration but Tolkien also knew about Latin, Greek and ancient Germanic languages when he began constructing Quenya. Another notable feature of Tolkien's Elvish language was his development of a complex internal history of characters to speak that language in their own fictional universe since he felt an aesthetic need to provide a historical background for the language itself.