Karabük is a town and the capital district of Karabük Province in the Black Sea region of Turkey. According to the 2009 census, population of the city is 108,167.

Karabük was built in the 1930s as the seat of the iron and steel industry of Turkey. Thus it has one of the worst, if not the worst, air pollution in the country, with a hazardous Air Quality Index of 328. Karabük lies in a location near Filyos River formed by the merge of Araç and Soganli rivers.

Karabük is situated on an important trade route between Amasra on the coast and central Anatolia. The history of the city goes back to the early years of the Turkish Republic, when it was a small sub-village formed by 13 houses in the Öglebeli village of Safranbolu. There was also a small train station on the Ankara-Zonguldak route. The town started to develop with the industrialization of the country. One of the first steel factories of the Republic was built here in1939, after which it grew rapidly and incorporated Öglebeli village as a quarter. Karabük became a municipality and then a township in the Safranbolu district in 1941. It became a district center in 1953 and a provincial center in 1995.

Hadrianapolis (now Eskipazar), is an ancient city from the Roman Empire of the 4th century, located about 3 km from Karabük. There are many fountains, churches, and Roman baths. Although most of it is recently excavated, illegal excavations which have been going on for many years and have damaged Eskipazar's chances of becoming a major tourist attraction.