The Grindau is an right-hand tributary of the River Leine in Lower Saxony (Germany).
The Grindau rises in the near Wedemark-Plumhof and flows initially westwards via Lindwedel, Adolfsglück, Hope (both parts of Lindwebel), Esperke to the village of (part of Schwarmstedt), where it discharges into the Leine.