The River Cong is a stream in the west of the county of Norfolk, only 1.5 miles (2.4 km) in length.

The spring rises in a meadow pool on the Hillington side of Manor Farm, Congham.

[2] The name of the stream does not appear on current Ordnance Survey maps, and few sources name it.

One appearance of the name is in the neighbouring village of Congham, whose name is listed by one source as meaning "dwelling by the River Cong",[3] though more recent sources suggest a possible direct meaning of dwelling "at the hill".

The Cong then flows on under the A148 and joins the Babingley close by the Gatton Waters caravan site.