Moineşti is a city in Bacău County, Romania. Its name is derived from the Romanian-language word moină, which means "fallow" or "light rain". Moineşti once had a large Jewish community; in Jewish contexts the name is often given as Mojnescht.
First mentioned in 1467, the locality was listed among the Moldavian villages on the Bawer map of 1783. A târg was first attested in this location in 1832; it had 188 houses and 588 inhabitants.
In 1921, Moineşti was designated a comună urbană ("urban commune"), with its own coat of arms and local administration, but a step short of being considered a city. It became a municipality in 2002.
The area around Moineşti is rich in natural resources such as petroleum, natural gas, salt and timber. Between the years 1950s and 1980s Moineşti experienced a steady economic growth thanks to the large petroleum extracting industry. After 1990, however, following the nation-wide industry privatization Moineşti's economy changed dramatically, at some points reaching level of unemployment of over 50%.
In 1996, honoring Tristan Tzara, the founder of Dadaism who was born in Moineşti, a monument was built on the side of the road that enters the town. It was created from concrete and steel by the German-Romanian sculptor Ingo Glass in the true Dada spirit and it is 25 meters long, 2,6 meters wide, 10 meters high and it weights 120 tons.