Multiple sclerosis (MS) is a chronic, immune-mediated disease of the central nervous system. Depression, or major depressive disorder, is highly prevalent in people with MS and often has a serious impact on quality of life. MDD can be difficult to treat with medications in MS. Transcranial magnetic stimulation (TMS) is a safe and approved treatment for treatment-resistant depression in the general population. However, little is known about the use of TMS for MDD in people with MS. This pilot study will evaluate the safety, feasibility, and preliminary efficacy of TMS for MDD in MS. Participants will receive outpatient neuronavigated-TMS for MDD. Various measures of MS and MDD symptoms will be monitored over the course of treatment. Clinical brain imaging will also be compared before and after TMS.