Riedau
Municipality
Coat of arms
Riedau Location within Austria
Coordinates: 48°18′04″N 13°38′03″E / 48.30111°N 13.63417°E / 48.30111; 13.63417
Country	Austria
State	Upper Austria
District	Schärding
Government
• Mayor	Berta Scheuringer (ÖVP)
Area [1]
• Total	7.62 km2 (2.94 sq mi)
Elevation	376 m (1,234 ft)
Population  (2018-01-01)[2]
• Total	2,069
• Density	270/km2 (700/sq mi)
Time zone	UTC+1 (CET)
• Summer (DST)	UTC+2 (CEST)
Postal code	4752
Area code	07764
Vehicle registration	SD
Website	www.riedau.at

Riedau is a municipality in the district of Schärding in the Austrian state of Upper Austria.

Riedau lies in the Innviertel. About 13 percent of the municipality is forest, and 71 percent is farmland.