The Wieda is a river in the German states of Lower Saxony and Thuringia.

The Wieda has its source above the village of Wieda, flows through the village of Walkenried, the hamlet of Wiedigshof [de] and the village of Gudersleben [de; nl] before discharging in the Harz river Zorge near Woffleben [de; nl], a district of Ellrich. Its channel regularly dries up in the summer months - it sinks into the karst soil and reappears in other places as springs. Its most important tributary is the Uffe.

• List of rivers of Lower Saxony
• List of rivers of Thuringia