Ključ (pronounced [kʎûːtʃ]) is a town and municipality by the same name in western Bosnia and Herzegovina. It is located in the Federation of Bosnia and Herzegovina, specifically the Una-Sana Canton. The name of the town and the municipality translates to "Key" in Bosnian.

It is located a short distance south from Sanski Most. The Sana River runs through the municipality. The terrain is heavily forested.

In 1991, the municipality of Ključ contained 61 places:

As a result of the civil war, the villages of Busije, Crkveno, Čađavica, Donja Previja, Donja Slatina, Donji Ribnik, Donji Vrbljani, Dragoraj, Gornja Previja, Gornja Slatina, Gornje Sokolovo, Gornji Ribnik, Gornji Vrbljani, Rastoka, Sitnica, Sredice, Stražice, Treskavac, Velijašnica, Velije et Zableće, as well as parts of Donje Ratkovo, Donje Sokolovo, Dubočani, Gornje Ratkovo, Jarice, Ljubine et Velečevo became a part of Ribnik municipality,Republika Srpska.

Today the municipality of Ključ has 40 localities :

The area is connected to other parts of Bosnia by the M-5 highway. Forestry, light industry and tourism are major components of the economy.

Oliver Dragojević (born December 7, 1947 in Vela Luka, FPR Yugoslavia) is one of the most popular Croatian pop singers. A native of Vela Luka from the island of Korčula, he emerged onto the music scene in the 1970s thanks to the popular Split Festival, one of several musical annual events which began in the former Yugoslavia and still is being held in Croatia today.

His speciality was music influenced by Dalmatian Folklore. His first domestic hit was called "Picaferaj" in 1967. Most of his early songs were written by popular songwriter Zdenko Runjić. One of the most famous was "Nadalina" which also featured actor Boris Dvornik, and the popular Dalmatian anthems "Galeb i ja" and "Skalinada".

Dragojević maintained his popularity in ensuing decades, while in the 1990s his songs became less influenced by domestic folk and more by global music trends. At that time he was often referenced as Croatia's oldest pop star. After his collaboration with Zdenko Runjić, he recorded several more albums that proved to be popular with his fan base.