A subgroup of patients with mild traumatic brain injury (mTBI) suffer from a series of post-concussion symptoms, such as headache, dizziness, and cognitive deficits. These patients also present altered neural connectivity compared to healthy controls (HC). In our study, we examined resting-state functional connectivity in 30 mTBI patients and 35 HC using independent component analysis. We found that patients showed lower functional connectivity in several resting-state networks, and the left frontoparietal network was associated with the level of dizziness in patients. We concluded that the alterations of resting-state neural networks may support post-concussion symptoms after mTBI.