The Alt Wurttemberg (also known as 'Old Wurttemberg') is a subtype of the Wurttemberg breed. It has the original heavy conformation which the Wurttemberg breed had before it was developed into a sport warmblood.

The development of the Alt Wurttemberg took place in the oldest stud farm in Germany: Marbach Stud. It started in the 16th century, when local mares were crossed with Arabian stallions. Then, during the 17th and 18th centuries, additional breeds were added, such as the Thoroughbred, Anglo-Norman, Clydesdale, Andalusian, Neapolitan, Mecklenburger, and Holsteiner, to name a few. The result was a somewhat heavy warmblood breed called "Wurttemberg", which was strong enough to work on the farm, and yet light enough to serve as a saddle horse. Today, this heavy form of Wurttemberg breed is known as 'Alt Wurttemberg'.

During the 1950s, the need for farm horses declined while the demand for sport horses increased. Therefore, the breeders at Marbach Stud decided to transform the Wurttemberg into a lighter breed that will serve as a sport horse. This process, which included crossing pure Wurttemberg with horses of other breeds, resulted in less and less purebred Alt Wurttembergs. This led to the old form of the Wurttemberg horse to almost go extinct. However, a program was set to preserve the breed. This program, which takes place in the Marbach Stud, prohibit crossbreeding of Alt Wurttembergs in order to preserve their purity.

Alt-Wurttemberg horses come in the colors of chestnut, bay, brown, black, and grey. They stand between 15.1hh and 16.1hh.