BYD Auto Co., Ltd. is the automotive subsidiary of the Chinese multinational BYD Co Ltd, which is based in Xi'an, Shaanxi Province.

The company produces automobiles, buses, electric bicycles, forklifts, rechargeable batteries and trucks. The current model range of automobiles includes electric vehicles, plug-in hybrids and petrol-engined vehicles.The Denza brand, a joint venture with Daimler AG, produces luxury electric cars.

BYD Co Ltd created the wholly owned subsidiary BYD Auto a year after its 2002 acquisition of the Norinco-owned Qinchuan Machinery Works, which may have been made solely to acquire the passenger car production license held by the purchased company. Qinchuan had been manufacturing cars since 1987, when the company began production of the 0.5 L (30.5 cu in) QJC7050 model. At the time of the acquisition, the QCJ7181 Flyer was in production, which from 2005 was rebadged to the "BYD Flyer."

In 2008, a plugin hybrid version of the BYD F3 compact sedan was introduced. Total sales in 2009 were 448,400 vehicles. In the same year, BYD began the export of its cars to Africa, South America and the Middle East. In 2013, BYD was awarded The Top Crash Facility Award of the year 2013.

In 2014, the BYD Qin plug-in hybrid had total sales of 14,747 (plus a relatively small number of sales in Latin America). By 2016, total sales of the Qin were 68,655 cars. BYD achieves top rankings of 2015 J.D Power's Quality Study.

According to global.chinadaily, BYD was the best-selling domestic electric car brand in China, with 229,506 units sold in 2019.

According to en.wikipedia and global.chinadaily.com.cn