The paper presents first results of a joint German–Tunisian research project in Carthage, Tunisia. Archaeological fieldwork has been undertaken (preceded by a geophysical survey) in the southwestern quarter of the ancient city to study the architecture, chronology and urban context of the circus. The area has, unlike the rest of Carthage, not been targeted by excavations of the late nineteenth/early twentieth centuries and, also unlike the rest of Carthage, is mostly not overbuilt, although under pressure from neighbouring communities. The area is the last one allowing a large-scale diachronic urban study in which the circus and its impact on the quarter is in the centre. From our first results, we can date the beginning of the construction of the circus to the late first century AD, with interventions in the early third century and usage continuing into the sixth. We were able to define the extension of the northern cavea and to study the western part of the spina and identify the meta at this point. Information has been obtained on early Roman, pre-circus use of the area as well as data on the Punic phases. Sixth- and seventh-century levels are also well preserved.