Ergenzingen is a suburban district of Rottenburg am Neckar in the administrative district of Tübingen in Baden-Württemberg (Germany).

Ergenzingen is located 12 km (7.45 mi) western from Rottenburg am Neckar, 11 km (6.83 mi) southeastern from Nagold and 13 km (8.07 mi) northeastern from Horb am Neckar.

The elevation is 436 to 499 m. The territory of the district is 1004 hectares.

So Ergenzingen is the largest district of Rottenburg.

The population of the village is predominantly Roman Catholic.