Oppenau
City
Coat of arms
Location of Oppenau within Ortenaukreis district
Oppenau Show map of Germany Oppenau Show map of Baden-Württemberg
Coordinates: 48°28′25″N 08°09′34″E / 48.47361°N 8.15944°E / 48.47361; 8.15944
Country	Germany
State	Baden-Württemberg
Admin. region	Freiburg
District	Ortenaukreis
Subdivisions	five Ortsteile
Government
• Mayor (2017–25)	Uwe Gaiser[1] (Ind.)
Area
• Total	73.04 km2 (28.20 sq mi)
Elevation	277 m (909 ft)
Population  (2022-12-31)[2]
• Total	4,936
• Density	68/km2 (180/sq mi)
Time zone	UTC+01:00 (CET)
• Summer (DST)	UTC+02:00 (CEST)
Postal codes	77724–77728
Dialling codes	07804
Vehicle registration	OG, BH, KEL, LR, WOL
Website	www.oppenau.de

Oppenau (German: [ˈɔ.pə.naʊ̯] ^ⓘ) is a city located in the state of Baden-Württemberg, Germany. It has a population of 4,700 inhabitants.

Oppenau is situated in the Rench valley in the Black Forest. The nearest major cities are Offenburg and Freudenstadt.

In the 12th century an agricultural settling made up the village Noppenouwe, which succumbed to the House of Zähringen until 1218. After they have been died out, the dominance in the Rench-valley was fragmented. The in 1192 in Lierbach founded All Saints’ Abbey took a high political, cultural and religious influence to Oppenau at this time. In 1316 bishops from the French Strasbourg started reign about the Rench-valley.

After the Reichsdeputationshauptschluss in 1803, Oppenau became part of Baden.

In 1990, German politician Wolfgang Schäuble suffered an assassination attempt in Oppenau.

Oppenau's main attractions are the ruins of the All Saints' Abbey, which was destroyed by fire in 1804, and the All Saints Waterfalls close to them.