Nizhny Kuchuk () is a rural locality (a selo) and the administrative center of Nizhnekuchuksky Selsoviet of Blagoveshchensky District, Altai Krai, Russia. The population was 464 as of 2016. There are 6 streets.
Nizhny Kuchuk is located east of Lake Kuchuk, by the Kuchuk River, 18 km south of Blagoveshchenka (the district's administrative centre) by road. Stepnoye Ozero is the nearest rural locality.
The village is inhabited by Russians, as well as other ethnic groups.