The Mattaponi River is a tributary of the York River estuary in eastern Virginia in the United States.

It rises as four streams in Spotsylvania County, each of which is given a shorter piece of the Mattaponi's name:

• The Mat River and the Ta River join in Spotsylvania County to form the Matta River;
• The Po River and the Ni River join in Caroline County to form the Poni River;
• The Matta River and the Poni River join in Caroline County to form the Mattaponi River.

From the confluence of its tributaries, the Mattaponi flows generally southeast through Caroline County, where it collects the South River; in its lower reaches it defines the boundary between King William and King and Queen Counties. At West Point, it meets the Pamunkey River to form the York River.

See also

• List of Virginia rivers

Rivers of Virginia | Chesapeake Bay Watershed | Caroline County, Virginia | King and Queen County, Virginia | King William County, Virginia | Spotsylvania County, Virginia

Rio Mattaponi