Beihai Park was an imperial garden and now a public park located to the northwest of the Forbidden City in Beijing. First built in the 11th century, it is among the largest of all Chinese gardens and contains numerous historically important structures, palaces, and temples. Since 1925, the place has been open to the public as a park. It is also connected at its northern end to the Shichahai.

Beihai literally means "Northern Sea". There are also corresponding Central (Zhonghai) and Southern (Nanhai) "Seas". These latter two are joined inside a complex of buildings known after them as Zhongnanhai; it is the home of China's paramount leaders.