Kowloon City (Chinese: 九龍城; pinyin: Jiǔlóngchéng) is an area in Kowloon, Hong Kong. It is named after the Kowloon Walled City, and is administratively part of Kowloon City District.

Comparing with the administrative Kowloon City District, the Kowloon City area is vaguely bounded south by Prince Edward Road West and Prince Edward Road East, north with Lo Fu Ngam, east with Kai Tak Nullah and west with Kowloon Tsai.

As early as in the Qin Dynasty (221 BC-206 BC), Kowloon City was famous for its pearl production. During the Song Dynasty (960-1279), Kowloon City was a part of Koon Fu Cheung (官富場), which was a part of salt yard governed by Chinese officials.

Part of the district was the location of the original Kowloon Walled City, erected during the Qing Dynasty. This is now Kowloon Walled City Park. The former Kai Tak International Airport was also located in the district.

In 1982, Hong Kong was divided into 18 administrative districts, and Kowloon City and its neighbouring areas, such as Hung Hom, belong to the Kowloon City District since then.

Kowloon (/ˌkaʊˈluːn/; traditional Chinese: 九龍; jyutping: gau²lung⁴) is an urban area in Hong Kong comprising the Kowloon Peninsula and New Kowloon. It is bordered by the Lei Yue Mun strait in the east, Mei Foo Sun Chuen and Stonecutter's Island in the west, the mountain range including Tate's Cairn and Lion Rock in the north, and Victoria Harbour in the south. It had a population of 2,019,533 and a population density of 43,033/km² in 2006. Kowloon is located north of Hong Kong Island and south of the mainland part of the New Territories. The peninsula's area is approximately 47 km² or 18.1 mi². Together with Hong Kong Island, it contains 48 percent of Hong Kong's total population.

The systematic transcription Kau Lung or Kau-lung was often used in derived place names before World War II, for example Kau-lung Bay instead of Kowloon Bay. Other spellings include Kauloong, Kawloong

The name Kowloon stems from the nine dragons, a term which refers to eight mountains and a Chinese emperor: Kowloon Peak, Tung Shan, Tate's Cairn, Temple Hill, Unicorn Ridge, Lion Rock, Beacon Hill, Crow's Nest and Emperor Bing (Song Dynasty).