Novopetrovka () is a rural locality (a selo) in Oktyabrsky Selsoviet, Kulundinsky District, Altai Krai, Russia. The population was 378 as of 2013. There are 3 streets.
Novopetrovka lies in the Kulunda Steppe, near lake Shchekulduk to the west. It is located 7 km southwest of Kulunda (the district's administrative centre) by road. Kulunda is the nearest rural locality.