The C-Group was a culture in ancient Nubia. It was named by George A. Reisner. With no central site, and no written evidence about what these people called themselves, Reisner assigned it a letter. The C-Group arose after Reisner's A-Group and B-Group cultures around the time the Old Kingdom was ending in Egypt.

While today many scholars see A and B as actually being a continuation of the same group, C-Group is more distinct. The C-Group is marked by its distinctive pottery, and for its tombs. Early C-Group tombs consisted of a simple "stone circle" with the body buried in a depression in the centre. The tombs later became more elaborate with the bodies being placed in a stone lined chamber, and then the addition of an extra chamber on the east: for offerings.

The origins of the C-Group are still uncertain. Some scholars see it largely being evolved from the A/B-Group. Others think it more likely that the C-Group was brought by invaders or migrants that mingled with the local culture, with the C-Group perhaps originating in the then rapidly drying Sahara.

The C-Group were farmers and semi-nomadic herders keeping large numbers of cattle in an area that is today too arid for such herding. Originally they were believed to be a peaceful people due to the lack of weapons in tombs. Their settling around the forts built by the Egyptians was seen as further evidence. Today some scholars argue the lack of weapons in tombs may have been cultural and that the forts might have been constructed by the Egyptians to control the C-Group peoples.

Most of what is known about the C-Group peoples comes from Lower Nubia, due to the extensive archaeological work conducted in that region. The northern border of the C-Group was around Kubaniek. The southern border is still uncertain, but C-Group sites have been found as far south as Eritrea.

During the Egyptian Sixth Dynasty, Lower Nubia is described of consisting of a number of small states, three of which are named: Setju, Wawat, and Irjet. At this same time in Upper Nubia the Kingdom of Kerma was emerging. The exact relation between the C-Group and Kerma are uncertain, but early Kerma shows definite similarities to the C-Group culture.

Under the Middle Kingdom much of the C-Group lands in Lower Nubia were conquered by Egypt; after the Egyptians left, Kerma expanded north controlling the region. With the conquest of Nubia by Egypt under Tuthmosis I in the late 16th century BCE, the C-Group disappears, merged, along with Kerma, into the Egyptianized Kush.