九龙（英语：Kowloon）是除香港岛及新界外，香港特别行政区的重要组成部份。九龙位于香港境内的地理中心，与南面的香港岛隔维多利亚港相望。香港十八区中油尖旺区、深水埗区、九龙城区、黄大仙区、观塘区皆属于九龙。

目前「九龙」由新九龙与「旧九龙」两部份组成，以界限街为界。新九龙北面有塞拉利昂，再加上九龙群山，把九龙与新界内陆分隔；「旧九龙」东、南和西面则被维多利亚港包围，三面环海，因此地理上「旧九龙」亦称为九龙半岛。

自1968年5月起，新九龙、九龙与香港岛重新分为十区，但一般香港市民在生活中都不会刻意区分，统一称为九龙。历年来的填海工程，使九龙的面积不断扩展，但仍是香港城市规划之三大主要部份中最小的，截至2010年，九龙的面积约47平方公里，2011年人口普查结果显示，全港约有29.82%人口居于九龙。

"Kowloon" is a transliteration of 九龍. For other transliterations, see 九龍 (disambiguation).

Kowloon (/ˌkaʊˈluːn/; Chinese:九龍; Jyutping:gaulung; Hong Kong Chinese: Giulung) 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/km 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 km (18 sq mi). Together with Hong Kong Island, they contain 48 percent of Hong Kong's total population.