渤海湾是渤海西部的一个海湾，位于河北省唐山，天津，河北省沧州和山东省黄河口之间。海河注入渤海湾。

渤海湾盆地形成于中生代和新生代。

渤海湾中有丰富的石油储藏。其北部是著名的旅游和度假区，西部天津是重要港口。

Bohai Bay (simplified Chinese:渤海湾; traditional Chinese:渤海灣; pinyin:Bóhǎi Wān) is one of the three bays forming the Bohai Gulf, the innermost gulf of the Yellow Sea, in northeast China. It borders Hebei province and Tianjin Municipality. The three bays are Laizhou Bay to the south, Liaodong Bay to the north, and Bohai Bay to the west.