Agile Software Development (ASD) has become the mainstream software development method of choice. Its core fundamentals are based on Teamwork factors and the higher value it gives to individuals and their interactions over processes and tools. Teamwork and human factors have been addressed as essential topics in the literature, and researchers have stated the importance of measuring it to increase the chances of success of ASD projects. However, there is no common understanding regarding the factors that should be considered for defining an ASD Teamwork construct. Driven by this problem, this paper presents a thematic network that defines the themes (i.e., factors) that should be considered when addressing ASD Teamwork. The ASD Teamwork thematic network is the result of a process that consisted of (i) defining the studies used as a data source through a literature review; (ii) extracting data from these studies; (iii) translating this data into codes; (iv) translating the codes into themes; (v) creating the model of higher-order themes; and, (vi) assessing the trustworthiness of the synthesis. The resulting thematic network comprises four higher-level themes: Cohesion, Orientation, Shared Leadership, and Autonomy. We believe that the constructed thematic network can be generalized to ASD and used as the basis by researchers who intend to explore ASD Teamwork. Further, practitioners can use our results to understand agile teams' dynamics better and improve their efficiency.