Quenya is one of the artificial languages created by J.R.R. Tolkien. It is featured in his books The Lord of the Rings (LotR), The Silmarillion, etc. It is also called the High Language, and Elvish Latin. There are many sites available to find out more about this lovely language and other things related to Tolkien and LotR:

Amanye Tenceli

Ardalambion

Barrow-Downs

ELM

Mellonath Daeron

Parma Penyane Quettaron

Quenya Study Group

Suit101.com