Purpose: To identify the most pressing needs for community resources to support physical activity participation, determinants of perceived need, and barriers to co-participation in physical activity among people with multiple sclerosis (MS) who have moderate-to-severe disability and the family caregivers providing assistance to such individuals. Methods: Seventy-eight people with MS and 46 family caregivers participated in this cross-sectional survey study, guided by the Concerns Report Methodology.