The Daqing–Guangzhou Expressway (大庆－广州高速公路), designated as G45 and commonly referred to as the Daguang Expressway (大广高速公路) is an expressway that connects the cities of Daqing, Heilongjiang, and Guangzhou, Guangdong. When fully complete, it will be 3,550 km (2,210 mi) in length.

Daqing is a prefecture-level city in the west of Heilongjiang province, People's Republic of China. The name literally means "Great Celebration" and refers to the tenth anniversary of the PRC. Daqing is known as the "Oil Capital of China" and has experienced a phenomenal boom since oil was discovered at the Daqing Oil Field in 1959.