Background. Spain has been one of the countries most affected by the COVID-19 pandemic. Objective. To create a registry of patients with COVID-19 hospitalized in Spain in order to improve our knowledge of the clinical, diagnostic, therapeutic, and prognostic aspects of this disease MESHD. Methods. A multicentre retrospective cohort study, including consecutive patients hospitalized with confirmed COVID-19 throughout Spain. Epidemiological and clinical data, additional tests at admission and at seven days, treatments administered, and progress at 30 days of hospitalization were collected from electronic medical records. Results. Up to April 30th 2020, 6,424 patients from 109 hospitals were included. Their median age TRANS was 69.1 years (range: 18-102 years) and 56.9% were male TRANS. Prevalences SERO of hypertension MESHD hypertension HP, dyslipidemia, and diabetes mellitus MESHD diabetes mellitus HP were 50.2%, 39.7%, and 18.7%, respectively. The most frequent symptoms were fever MESHD fever HP (86.2%) and cough MESHD cough HP (76.5%). High values of ferritin (72.4%), lactate dehydrogenase (70.2%), and D-dimer (61.5%), as well as lymphopenia MESHD lymphopenia HP (52.6%), were frequent. The most used antiviral drugs were hydroxychloroquine (85.7%) and lopinavir/ritonavir (62.4%). 31.5% developed respiratory distress HP. Overall mortality rate was 21.1%, with a marked increase with age TRANS (50-59 years: 4.2%, 60-69 years: 9.1%, 70-79 years: 21.4%, 80-89 years: 42.5%, [≥] 90 years: 51.1%). Conclusions. The SEMI-COVID-19 Network provides data on the clinical characteristics of patients with COVID-19 hospitalized in Spain. Patients with COVID-19 hospitalized in Spain are mostly severe cases, as one in three patients developed respiratory distress HP and one in five patients died. These findings confirm a close relationship between advanced age TRANS and mortality.