Tiverton is a town in Newport County, Rhode Island, United States. The population was 16,359 at the 2020 census.

Tiverton is located on the eastern shore of Narragansett Bay, across the Sakonnet River from Aquidneck Island (also known as the Island of Rhode Island). Together with the adjacent town of Little Compton, the area is disconnected from the rest of the state of Rhode Island. The northern portion of the town is located on Mount Hope Bay.

Much of the town is located along a granite ridge which runs in a north–south direction, rising approximately 170 feet in elevation from the bay. A large section of exposed granite can be observed at the highway cut for Route 24, near the Main Road interchange.

According to the United States Census Bureau, Tiverton has a total area of 36.3 square miles (94 km²), of which 29.4 square miles (76 km²) is land and 18.0 km² (6.9 sq mi); 19.16%) is water.

The northern portion of greater Tiverton is also known as North Tiverton.

At times, Tiverton has been considered a part of the South Coast region of Massachusetts despite the town residing entirely within Rhode Island. By its most literal definition, the South Coast encompasses the geographic area of Massachusetts that borders Buzzards Bay (excluding the Elizabeth Islands, Bourne and Falmouth), Mount Hope Bay and the Sakonnet River. It has been argued that Little Compton and Tiverton share more in common with the regional identities of the South Coast communities of Westport, Dartmouth and Fall River than the rest of Newport County.

Tiverton was incorporated by English colonists in 1694 within Bristol County in the Province of Massachusetts Bay. As well as being part of Old Dartmouth. In 1746, in the final settlement of a long colonial boundary dispute between Rhode Island and Massachusetts, Tiverton—together with its fellow towns along the eastern shore of Narragansett Bay, Barrington, Bristol and Little Compton, and the town of Cumberland, to the north of Providence—were annexed to Rhode Island by Royal Decree. Tiverton was incorporated as a town in 1747. Until that year, Tiverton also controlled the area of East Freetown, Massachusetts, as an outpost. The boundary settlement of 1746 had put East Freetown in Massachusetts, and in 1747 it was purchased by Freetown.

Men from the Tiverton outpost took part in the Battle of Freetown, on May 25, 1778, during the Revolutionary War. On the 31st of that month, a party of about 150 British regulars of the 22nd Regiment under the command of Lieutenant-Colonel Campbell attacked the town. Rivington's Gazette reported that the British were making a preemptive attack based on intelligence that the American militia at Tiverton was preparing an attack against them. However, another report in the New Hampshire Gazette stated the militia was waiting in prepared defensive positions. The result of this skirmish was two British killed, several more wounded, and some fire damage to the lower mill in Tiverton. None of the militiamen were wounded or killed.