Immunocompromised patients, especially those hospitalized, are at higher risk for infection with opportunistic pathogens such as Stenotrophomonas maltophilia (S. maltophilia) which is a multidrug-resistant gram-negative bacillus and can cause a challenge in the management of patients with concomitant COVID-19 and S. maltophilia pneumonia. A 71-year-old man with Hodgkin's lymphoma presented with severe respiratory symptoms of COVID-19 and was intubated upon admission and the initial standard treatment for COVID-19 was started for him. The patient subsequently developed superimposed bacterial pneumonia with S. maltophilia. According to that, the patient's intubation tube was removed and a tracheostomy was performed for him. Also, antibiotic treatment was replaced with Colistin and Co-trimoxazole drugs. Finally, after 31 days of hospitalization in the ICU and the aappropriate drug treatment, he was discharged with reduced symptoms and partial recovery. It should be noted that the occurrence of co-infection with multidrug-resistant pathogens such as S. maltophilia requires proper management to select appropriate treatment methods and drugs so that in addition to proper effectiveness, it does not lead to side effects and complications associated with COVID-19 disease.