Liaodong Bay
Simplified Chinese	辽东湾
Traditional Chinese	遼東灣
Transcriptions Standard Mandarin Hanyu Pinyin Liáodōng Wān

Liaodong Bay is largest and longest of the three main bays of the Bohai Sea, the innermost gulf of the Yellow Sea. The other two bays are Laizhou Bay to the south and Bohai Bay to the southwest.

Although named after the Liaodong Peninsula (which forms its eastern shore), the bay is located directly south of the Liaoxi region, almost entirely west of the Liao River. It is bounded by the coastline of cities from southern Liaoning province (Dalian, Yingkou, Panjin, Jinzhou and Huludao) and eastern Hebei province (Qinhuangdao and Tangshan), between the Laotieshan Cape at Dalian's Lüshunkou District in the east, and the Daqing River estuary (which is an old southern mouth of Luan River) at Tangshan's Laoting County in the west.

The major rivers that drain into the Liaodong Bay include Luan River, Daling River, Xiaoling River, Liao River and Daliao River.