The River Gipping is the source river for the River Orwell in the county of Suffolk in East Anglia, England, which is named from the village of Gipping, and which gave its name to the former Gipping Rural District. It rises near Mendlesham Green and flows in a south-westerly direction to reach Stowmarket. From there it flows towards the south or south east, passing through Needham Market then Baylham. The river continues to flow south between Great Blakenham and Claydon, and through Bramford and Sproughton until it flows into Ipswich, where it becomes the Orwell at Stoke Bridge. The river has supplied power to a number of watermills, several of which are still standing. None are operational, although the mill at Baylham retains most of its machinery, and is the only complete mill on the river.

The River Orwell flows through the county of Suffolk in England from Ipswich to Felixstowe. Above Ipswich, the river is known as the River Gipping, but its name changes to the Orwell at Stoke Bridge, where the river becomes tidal. It broadens into an estuary at Ipswich, where the Ipswich dock has operated since the 7th century, and then flows into the North Sea at Felixstowe, the UK's largest container port, after joining the River Stour at Shotley forming Harwich harbour.