Chojnów  (Haynau) is a small town (14,389 inhabitants as of 2006) on the Skora river, in Legnica County, (Lower Silesian Voivodeship), in south-western Poland. Its average altitude is 170 meters above sea level. It is the administrative seat of the rural gmina called Gmina Chojnów, although the town is not part of its territory (Chojnów forms a separate urban gmina).
The first reference to Chojnów is dated 1272 (as Haynow settlement). In 1288 it was called a city (civitas) in documents of the Prince of Legnica Henryk V Gruby, but as soon as 1333 it had gained town privileges.
The local government-run weekly newspaper is Gazeta Chojnowska, which has been published since 1992.
Every year in the first days of June, the Days of Chojnów (Dni Chojnowa) are celebrated. The Whole-Poland bike race Masters has been organized yearly in Chojnów for the past few years.
Chojnów is an industrial and agricultural city. Among products produced in Chojnów are: paper products, agricultural machinery, chains, metal furniture for hospitals, equipment for the meat industry, beer, wine, leather clothing, and clothing for infants, children and adults.
Among the interesting monuments of Chojnów are the 13th century castle of the Prince of Legnica (currently used as a museum), two old churches, the Baszta Tkaczy (Weavers' Tower) and preserved fragments of city walls.
The biggest green area in Chojnów is small forest Park Piastowski (Piast's Park), which was named after the Piast dynasty as part of Communist anti-German propaganda upon its annexation to Poland according to the Potsdam Conference. From the Late Middle Ages until 1945 Haynau (Chojnów) was thoroughly ethnic German, part of the German Empire and the Weimar Republic. After the war the German population was ethnically cleansed from the region.