Wentorf bei Hamburg is a municipality located in the district of Lauenburg within the German state of Schleswig-Holstein. The town is situated on the river Bille and serves as a neighboring community to the town of Reinbek.
Geographically, Wentorf bei Hamburg lies approximately 10 km northwest of Geesthacht. It is positioned on the city limits of Hamburg, located roughly 20 km east of the city's center.