Bacău County is a county (județ) of Romania, in Western Moldavia, with its capital city at Bacău. It has one commune, Ghimeș-Făget, in Transylvania.

Western Moldavia, also called Romanian Moldavia, or simply just Moldova is the core historic and geographical part of the former Principality of Moldavia situated in eastern and north-eastern Romania. Until its union with Wallachia in 1859, the Principality of Moldavia also included, at various times in its history, the regions of Bessarabia, all of Bukovina, and Hertsa; the larger part of the former is nowadays the independent state of Moldova, while the rest of it, the northern part of Bukovina, and Hertsa form territories of Ukraine.