Middle school (MS) parents may benefit from education supporting timely concussion identification and care-seeking in their young children (aged approximately 10 to 15 years). However, such education may not consider individual needs and different social context factors, including lower socioeconomic status, disadvantaged social determinants of health, and different racial and ethnic backgrounds. To examine the relationship between social context factors and concussion knowledge, attitudes, and communication in MS parents and to explore the possible role of race and ethnicity (Black or White) as an effect measure modifier. Cross-sectional study. Online survey. A nationally representative sample of MS parents who completed an online survey (n = 1248). Parent outcomes were a history of concussion education, concussion symptom knowledge and attitudes, and communication with children about concussion. Main exposures were parental race and ethnicity (Black or White) and social context factors. Uni- and multivariable statistical analyses were performed to achieve the study aims. Black parents were more likely than White parents to have received concussion education (69.5% versus 60.5%, P = .009), although median concussion knowledge scores were higher for White parents than for Black parents (40 versus 37, P < .001). Few associations were found for social context factors with concussion knowledge, attitudes, and communication in Black and White parents separately. Among MS parents, race and ethnicity may not influence the association between social context factors and concussion-related knowledge, attitudes, or communication. However, differences were present by race and ethnicity regarding previous concussion education and other parental outcomes, concussion symptom knowledge in particular.