Broken Hill is a city in the far west region of outback New South Wales, Australia. An inland mining city, it is near the border with South Australia on the crossing of the Barrier Highway (A32) and the Silver City Highway (B79), in the Barrier Range. It is 315 m (1,033 ft) above sea level, with a cold semi-arid climate, and an average rainfall of 265 mm (10.4 in). The closest major city is Mildura, 300 km (190 mi) to the south and the nearest State Capital City is Adelaide, the capital of South Australia, which is more than 500 km (310 mi) to the southwest and linked via route A32, the Barrier Highway.

The town is prominent in Australia's mining, industrial relations and economic history after the discovery of silver-lead-zinc ore led to the opening of various mines, thus establishing Broken Hill's recognition as a prosperous mining town well into the 1990s. Despite experiencing a slowing economic situation into the late 1990s and 2000s, Broken Hill itself was listed on the National Heritage List in 2015 and remains Australia's longest running mining town.

Broken Hill, historically considered one of Australia's boomtowns, has been referred to as "The Silver City", and less commonly as the "Oasis of the West", and the "Capital of the Outback". Although over 1,100 km (680 mi) west of Sydney and surrounded by desert, the town has prominent park and garden displays and offers a number of attractions, such as the Living Desert Sculptures. The town has a high potential for solar power, given its extensive daylight hours of sunshine. In the Broken Hill region, the major Aboriginal language groups are the Paakantji, Mayyankapa, and Nyiimpaa.

Unlike the rest of New South Wales, Broken Hill (and the surrounding region) observes Australian Central Standard Time (UTC+9:30), the same time zone used in nearby South Australia. This is because at the time the Australian dominions adopted standard time, Broken Hill's only direct rail link was with Adelaide, not Sydney. Similarly, Broken Hill is regarded as part of South Australia for the purposes of postal parcels rates and telephone charges. Broken Hill also used to be a break of gauge station where the state railway systems of South Australia and New South Wales met.

Broken Hill is Australia's longest-lived mining city. In 1844, the explorer Charles Sturt saw and named the Barrier Range, and at the time referred to a "Broken Hill" in his diary. Silver ore was later discovered on this broken hill in 1883 by boundary rider Charles Rasp. The broken hill that gave its name to Broken Hill actually consisted of a number of hills that appeared to have a break in them. This broken hill no longer exists, having been mined away.

The area was originally known as Willyama.

Broken Hill's massive orebody, which formed about 1,800 million years ago, has proved to be among the world's largest silver–lead–zinc mineral deposits. The orebody is shaped like a boomerang plunging into the earth at its ends and outcropping in the centre. The protruding tip of the orebody stood out as a jagged rocky ridge amongst undulating plain country on either side. This was known as the Broken Hill by early pastoralists. Miners called the ore body the Line of Lode. A unique mineral recently identified from Broken Hill has been named Nyholmite after Ron Nyholm (1917–1971). Lead with the isotope signature of the Broken Hill deposits has been found across the entire continent of Antarctica in ice cores dating back to the late nineteenth century.

The earliest human settlers in the area around Broken Hill are thought to have been the Wiljakali Indigenous Australians, once thought to have only intermittently lived in the area because of the lack of permanent water sources.