北海, meaning "North Sea" in Chinese and Japanese, may refer to:
Hokkai (北海), a disused Japanese name for the Sea of Okhotsk Hokkaido (北海道), one of the main islands of Japan Beihai Park (北海公园/北海公園), a well-known park in Beijing Beihai City (北海市), a prefecture-level city in Guangxi lying on the Gulf of Tonkin Lake Baikal (北海), a Siberian lake north of Outer Mongolia North Sea (北海((大西洋))), a marginal sea of the Atlantic Ocean located between Great Britain, Scandinavia, Germany, the Netherlands, Belgium, and France County, North sea (北海郡), an administrative division during the Western Han period