Širvinta River

Infobox River
river_name = Širvinta River

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caption = Širvinta River near Upninkai
origin = 9 km northeast of Paberžė
mouth = Šventoji River
basin_countries = Lithuania
length = 129 km
elevation =
mouth_elevation =
discharge = 7.5 m³/s
watershed = 918 km²

Širvinta is a river in Lithuania. Stretching for 129 km, it is the longest tributary of Šventoji River. It flows through Ukmergė district and Širvintos district and borders Jonava district. Širvinta passes through Širvintos City, where a weir has been built. It inflows Šventoji River between Upninkai and Vepriai.

Širvinta is distinctive for its rapid stream and winding, rocky bed, appreciated by kayak enthusiasts. Širvinta Landscape Reserve, covering picturesque river banks and scarps of Širvinta, was established in 1992 to protect the channel's unique landscape. Some of the loamy scarps near Upninkai reach as high as 40 meters.

A name of the river is possibly derived from the Baltic adjective "širmas/širvas", meaning "brown".