Although organisations often implement team-based structures to improve performance, such restructuring does not automatically ameliorate poor performance. The study in this article explores the relationship between team members' negative mood and team processes (social cohesion, workload sharing, team conflict) to determine if negative mood has a detrimental effect on team performance via team processes. Two hundred and forty one participants completed surveys and were involved in an independently rated performance task that was completed over eight weeks. Negative mood was found to influence team processes and as a consequence, team performance. The results, however, were not uniformly negative. Implications for theory and practice are discussed.