Rossosz [ˈrɔsːɔʂ] is a village in Biała County, Lublin Voivodeship, Poland.

Rossosz was located along a route from Kraków to Vilnius, and frequently changed owners.

In early 17th century, it belonged to Stanislaw Koniecpolski, who in 1624 sold it to Mikolaj Firlej.

The newly rebuilt town was completely ransacked and burned to the ground by Swedes and Transilvanians in Swedish invasion of Poland (1655–1660).

In 1815–1915 Rossosz belonged to Russian-controlled Congress Poland, and during the January Uprising, a skirmish between Russians and Polish rebels took place here.