Almost half of patients with multiple sclerosis (MS) experience tremor, which significantly worsens disability. Pathophysiology studies of MS tremor have highlighted the importance of the cerebello-thalamo tract. This study aimed to use resting-state fMRI to identify brain networks that are dysfunctional in MS tremor. We found significantly higher connectivity within the motor network in tremor patients compared to controls, and the mean activation within the motor network was negatively correlated to tremor. Resting-state fMRI could provide useful markers for studying the pathophysiology of tremor in MS.