Shanghaiguan () is a part of the city of Qinhuangdao, in Hebei province, People's Republic of China. It literally means "The Pass of Mountain and Sea".

It is a popular tourist destination, featuring the eastern end of the Great Wall. The "First Pass Under Heaven" is also a noticeable tourist attraction.

It is nearly 300 km. east of Beijing and linked via the Jingshen Expressway.

Throughout Chinese history, it served as a frontier of defence against tribes from Manchuria (e.g. the Khitan, Jurchen and the Manchus)