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Background and Aims As of November 2020, the Coronavirus Disease 2019 (COVID 19) has infected more than 396,000 people in the Philippines. Although no study has been done on malnutrition among a general cohort of patients with COVID 19, it has long been associated with increased mortality and poor long-term outcomes. We aimed to determine the prevalence of malnutrition among patients with COVID 19 admitted in a tertiary government hospital. Methods Cross-sectional study on COVID 19-confirmed patients admitted to the COVID 19 wards from July 15 to September 15, 2020. Nutritional status was assessed using the Philippine Society for Parenteral and Enteral Nutrition (PhilSPEN) modified Subjective Global Assessment Grade (SGA) tool. Malnutrition was defined as those with SGA grades B and C. Chi-square test or Fisher exact test of association, as appropriate, was used to identify factors that have a significant association with malnutrition. Furthermore, logistic regression was done on factors with significant association. Results Among the 355 adult patients in the study, 71.83% (255/355) were malnourished [SGA B: 48.73% (173/255); SGA C: 23.10% (82/255)]. The following were shown to have significant association with malnutrition: community-acquired pneumonia (CAP) [p-value < 0.001], hospital-acquired pneumonia (HAP) [p-value 0.002], and chronic kidney disease (p-value 0.033). Multivariable logistic regression revealed that age [OR 1.02, CI 95% 1.00, 1.04, p-value 0.027] and CAP-Moderate Risk (MR) [OR 3.02, CI 95% 1.73, 5.27, p-value < 0.001] are significant predictors of malnutrition. All patients with CAP- High Risk and HAP were malnourished. Conclusion The prevalence of malnutrition was high (71.83%) in a general cohort of COVID 19 patients as measured by the modified SGA tool. The following are risk factors of malnutrition among patients with COVID 19: age, CAP, and HAP. Nutritional support and management of comorbidities are of paramount importance in the care of patients with COVID 19.