The Ya is a 38-kilometer (24 mi) river in the municipality of Tynset in Innlandet county, Norway.

The Midtya (Middle Ya) is a higher tributary of the Nordya.

[2] The largest source of the Ya is Falningsjøen (Lake Falning, elevation 850 meters or 2,790 feet) via the tributary Falninga; the lake is used as a reservoir for the Ulset Hydroelectric Power Station.

Together with its tributaries, the Ya has a drainage area of 285 square kilometers (110 sq mi).

The Ya river system runs through Forollhogna National Park and the Grøntjønnan Nature Reserve.