Neckarsulm (German pronunciation:[nɛkarˈzʊlm]) is a city in northern Baden-Württemberg, Germany, near Stuttgart, and part of the district Heilbronn. As of 2004, Neckarsulm had 27,296 inhabitants.

The rivers Neckar and Sulm join there, hence the name, which is often misunderstood or mispronounced as "Neckars Ulm", an incongruity which would mean the Ulm of the Neckar, as the city of Ulm is well to the East on the Danube at the border between Baden-Wuerttemburg and Bavaria.