Background The long-term pulmonary consequences and impact on respiratory function among patients discharged from intensive care unit (ICU) after severe COVID-19 are not well known. The purpose of this study was to investigate the pulmonary sequelae and long-term respiratory function of patients with severe COVID-19 who were discharged from the ICU. Materials and Methods This prospective cohort study. First, 3rd, and 6th month symptoms, laboratory data, 6-minute walk test, sit-to-stand test, BORG scale, pulmonary function test, chest X-ray, and thorax computed tomographys (CTs) of patients diagnosed with COVID-19 who were treated and discharged from the ICU. RESULTS Sixty (74%) of the 81 patients included in the study were male, and the median age was 49 (43-61). The most common symptoms upon admission were dyspnea (69%), cough (42%), fever (47%), and fatigue (37%). At the 6-month follow-up, 30 (45%) of the 66 patients had at least one complaint, with dyspnea, cough, and muscle pain being the most common. When the symptoms of patients upon admission were compared with those during the 1st, 3rd, and 6th months of follow-up, it was found that the symptoms of dyspnea, cough, and fatigue regressed. Furthermore, laboratory parameters such as lymphocyte and eosinophil counts, neutrophil lymphocyte ratio, lactate dehydrogenase, C-reactive protein, ferritin, and D-dimer levels were improved (p<0.01). At the 6-month follow-up, thorax CT scans showed ground glass infiltration in 7 (28%) patients, fibrosis in 4 (16%), band atelectasis in 2 (8%), and fibrotic bands in 8 (32%). 12% of patients had normal thorax CT scans. CONCLUSION There has been a growing body of knowledge regarding the long-term impacts of COVID-19. Prolonged symptoms are linked to illness convalescence and the potential development of fibrosis, emphasizing the need for regular post-discharge monitoring of patients. It is recommended that a minimum of 6 months after the onset of COVID-19 is an appropriate duration to identify the long-term effects of COVID-19.