Background: Coronavirus disease 2019 (COVID-19) has become a pandemic, and patients receiving immunosuppressive agents could be at a higher risk of the infection. Patients’ knowledge and behavior play a major role in their health. Physicians should provide patients with enough information regarding medication use, prevention strategies, and treatment choices in case of infection. Objectives: This study aimed to evaluate the attitude and knowledge of Iranian patients with multiple sclerosis (MS) about COVID-19, as provided by physicians. Methods: A google form was designed, and the patients consented to fill out the survey. The participants’ basic characteristics were collected. Moreover, they were asked about COVID-19 transmission routes and prevention strategies, their concerns regarding MS-related checkups during the COVID-19 pandemic, COVID-19 infection tests, COVID-19 symptoms, and information they received from their physicians about what to do in case of COVID-19 infection. Results: Four hundred and ten forms were collected. The mean age of the patients and the mean duration of the disease were 34.5 ± 8 and 7.2 ± 5.7 years, respectively. Nearly 80% of the respondents believed that patients with MS were at a higher risk of COVID-19 infection, and 75% of them thought that wearing a face mask could prevent the infection transmission. Moreover, only 21% of 410 the physicians informed their patients of when to stop their medication if they were suspected to have COVID-19, and 22% of them informed their patients of where to refer in case of COVID-19 suspicion. Nearly half of all physicians prescribed immune-boosting supplements, such as selenium, zinc, and vitamin D. Conclusions: The results showed that Iranian MS patients had good knowledge regarding COVID-19 prevention strategies and transmission routes. However, they received less information from their physicians regarding medication use control, centers for admission, and physician consultation in case of COVID-19 infection.