Riesa (Upper Sorbian: Ryzawa) is a town in the district of Meißen in Saxony, Germany.

This name, romanised as "Rezoa", appears first in October 1119 in a document from Pope Callixtus II.

Riesa has a 25 m tall, 234 tonne, cast-iron (GGG 40) sculpture of an oak trunk, named Elbquelle, which means source of the Elbe, by Jörg Immendorff, erected in 1999.

Local folk call the sculpture by many other names, most notably "Rostige Eiche", which means "Rusty Oak".

Riesa is located on Bundesstraße 169, which ensures access to federal motorways A 14 (close to Döbeln, approx.